Fill in the gaps with before,after,since,by,ago,until,by the time. 1.I live in San Francisco five years . 2. …… Carol had fed the baby , she went to bed.
3. ….. we reached the port , the weather had improved.
4. She bought a newspaper …… she went to work.
5. …. he’s been in London he’s visited the Tate Gallery and the Museum of Natural History.
6. I have to type fifteen letters ….. 4 o’clock.
7. Tommy met his friends …. he had finished studying for the exam.
8. Yesterday she worked ….. 7 o’clock because she was very busy.
9. How many years …… did they first meet?
10. ….. we got home, the rain had stopped.

1. I live in San Francisco five years ago.
Explanation: "Five years ago" indicates a specific time in the past when the speaker started living in San Francisco.

2. After Carol had fed the baby, she went to bed.
Explanation: "After" implies that the action of feeding the baby happened first, and then Carol went to bed.

3. By the time we reached the port, the weather had improved.
Explanation: "By the time" indicates that the improvement in weather happened before reaching the port.

4. She bought a newspaper before she went to work.
Explanation: "Before" indicates that buying the newspaper happened first, and then she went to work.

5. Since he's been in London, he's visited the Tate Gallery and the Museum of Natural History.
Explanation: "Since" indicates that the person started being in London at a specific time, and since then, they have visited the Tate Gallery and the Museum of Natural History.

6. I have to type fifteen letters by 4 o’clock.
Explanation: "By" indicates a deadline or a specific time limit for completing the action of typing fifteen letters.

7. Tommy met his friends after he had finished studying for the exam.
Explanation: "After" implies that finishing studying for the exam happened first, and then Tommy met his friends.

8. Yesterday she worked until 7 o’clock because she was very busy.
Explanation: "Until" indicates the duration or the specific time when the action (working) stopped, which is 7 o'clock in this case.

9. How many years ago did they first meet?
Explanation: "How many years ago" is used to ask about the specific time in the past when they first met.

10. By the time we got home, the rain had stopped.
Explanation: "By the time" indicates that the rain stopped before reaching home.