4 Complete the sentences with the correct form of the words in brackets.
1 Julie's room was so
(tidy) that she was unable to see the floor.
2 It is
(legal) to get on a train without a ticket.
3 What's the problem Mr Jones? Are you
(happy) with your room?
4 I don't like waiting for buses. I'm too
(patient). I usually start walking before the bus arrives.
5 I think that camping is
(popular) with adults because they prefer to sleep in a bed.
6 I tried to buy a ticket in France, but the man at the ticket office was very
(helpful).
7 Jerry was sad because he was
(able) to go to his favourite festival.
8 I am
(certain) when we will arrive because our train is delayed.

1 Julie's room was so tidy that she was unable to see the floor.
Explanation: In this sentence, we need to choose the correct form of the word "tidy". The adjective form of "tidy" is used to describe the condition of Julie's room. Since the sentence talks about the room being very tidy, we need to use the word "tidy" in its superlative form, which is "tidiest". However, since the given sentence does not require a superlative form, but rather a simple description of the room being tidy, we should use the base form of the word, which is "tidy".

2 It is legal to get on a train without a ticket.
Explanation: Here, we need to choose the correct form of the word "legal". The word "legal" is an adjective that means something is allowed or permitted by law. In the given sentence, the use of the word "legal" implies that it is allowed to board a train without a ticket. Therefore, we should use the base form of the word "legal" without any changes.

3 What's the problem Mr Jones? Are you happy with your room?
Explanation: In this sentence, we need to choose the correct form of the word "happy". The word "happy" is an adjective that describes a feeling of joy or contentment. In the given sentence, Mr. Jones is being asked about his satisfaction with his room. Since we are asking about his current state of being "happy" with the room, we should use the adjective form "happy".

4 I don't like waiting for buses. I'm too patient.
Explanation: Here, we need to choose the correct form of the word "patient". The word "patient" is an adjective that describes the ability to tolerate waiting or delays without becoming annoyed or frustrated. In the given sentence, the speaker is stating that they are "too patient" to wait for buses, which means that they have a high level of tolerance for waiting. Therefore, we should use the adjective form "patient".

5 I think that camping is popular with adults because they prefer to sleep in a bed.
Explanation: In this sentence, we need to choose the correct form of the word "popular". The word "popular" is an adjective that means something is liked, admired, or enjoyed by a large number of people. In the given sentence, it is stated that camping is popular with adults because they prefer to sleep in a bed. Therefore, we should use the base form of the word "popular" without any changes.

6 I tried to buy a ticket in France, but the man at the ticket office was very helpful.
Explanation: Here, we need to choose the correct form of the word "helpful". The word "helpful" is an adjective that describes someone who is willingly providing assistance or support. In the given sentence, it is stated that the man at the ticket office in France was "very helpful" in assisting the speaker with buying a ticket. Therefore, we should use the adjective form "helpful".

7 Jerry was sad because he was unable to go to his favorite festival.
Explanation: In this sentence, we need to choose the correct form of the word "able". The word "able" is an adjective that describes someone's capability to do something. In the given sentence, Jerry is described as being unable to go to his favorite festival, which means he lacks the ability or opportunity to attend. Therefore, we should use the adjective form "unable".

8 I am certain when we will arrive because our train is delayed.
Explanation: Here, we need to choose the correct form of the word "certain". The word "certain" is an adjective that means having no doubt or being confident about something. In the given sentence, the speaker states that they are confident about the arrival time because their train is delayed. Therefore, we should use the adjective form "certain".