1. When I walk (A) past the park, I saw some children play football.
2. After John eaten (A) dinner, he wrote several letters and went to bed.
3. What did you do (A) at 9 o’clock last night (B)? I phoned (C) you but nobody (D) answered.
4. When (A) I arrived (B) at (C) the station, the train has already left (D)
. 5. Ann and Susan have known (A) each other (B) during (C) they were (D) at school.
6. She has disappeared (A) three days ago, and (B) they are still (C) looking for her (D) now.
7. After Mrs. Wang had returned (A) to her house (B) from work (C), she was cooking (D) dinner
8. It’s (A) the first time (B) I saw (C) this film (D)
9. After (A) he graduates (B) from (C) university, he joined the army (D).
10. Up to now (A), there had been (B) no (C) woman being chosen (D) the US president.
1. A walk -> was walking
2. A eaten -> has eaten
3. A did you do -> were you doing
4. D has already left -> had already left
5. B during -> since
6. A has disappeared -> disappeared
7. A had returned -> returned
8. C saw -> have seen
9. B graduates -> had graduated
10. B had been -> has been
1-A
2-A
3-A
4-D
5-C
6-A
7-D
8-C
9-B
10-B
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