I. Choose the correct item and justify your choice.

1. This bus is full, we’ll take/’re taking the next one. (future simple – on-the-spot decision)

2. They’ll be leaving/’ll leave for Mexico on the 7:00 am flight.

3. Watch out! You’re stepping/’re going to step into that mud puddle.

4. Will you be going/Will you go to the gym tonight? I need a lift.

5. The ski lifts open/will have been opening at 9:00 am.

6. Mum is serving/will have served dinner by the time we get home.

7. Listen to the instructor carefully or you aren't going to know/won’t know how to perform the jump safely.

8. My birthday is going to fall/will fall on a Saturday this year.

9. By the time he retires, he will have been working/will be working with sharks for over 30 years.

10. The Thompsons have/are having a barbecue this weekend.

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1. This bus is full, we'll take/are taking the next one.
- The correct answer is "we'll take" because it implies an on-the-spot decision. We use the future simple tense to talk about actions we decide to do at the moment of speaking.

2. They'll be leaving/will leave for Mexico on the 7:00 am flight.
- Both choices can be correct depending on the context, but the more appropriate answer here is "will leave" because it indicates a scheduled departure.

3. Watch out! You're stepping/are going to step into that mud puddle.
- The correct answer is "are going to step" because it implies a future action that is planned or intended.

4. Will you be going/Will you go to the gym tonight? I need a lift.
- Both choices can be correct depending on the context, but the more appropriate answer here is "Will you go" because it indicates a simple future action.

5. The ski lifts open/will have been opening at 9:00 am.
- The correct answer is "open" because it refers to a general truth or a routine action. We use the present simple tense to talk about scheduled events.

6. Mum is serving/will have served dinner by the time we get home.
- The correct answer is "will have served" because it refers to a completed action in the future before another action happens.

7. Listen to the instructor carefully or you aren't going to know/won't know how to perform the jump safely.
- Both choices can be correct depending on the context, but the more appropriate answer here is "won't know" because it refers to a future consequence.

8. My birthday is going to fall/will fall on a Saturday this year.
- Both choices can be correct depending on the context, but the more appropriate answer here is "is going to fall" because it refers to a future event that is planned or expected.

9. By the time he retires, he will have been working/will be working with sharks for over 30 years.
- Both choices can be correct depending on the context, but the more appropriate answer here is "will have been working" because it refers to a completed action in the future before another action happens.

10. The Thompsons have/are having a barbecue this weekend.
- Both choices can be correct depending on the context, but the more appropriate answer here is "are having" because it refers to a future event that has been planned or arranged.

Remember, the choice of the correct tense depends on the specific context and meaning of the sentence.