QKĐ & QKTD với WHEN & WHILE

When the teacher came in, they _____ (study) English.

• were studying

• studied

• was studying

The baby was sleeping when the telephone _____ (ring).

• rang

• ring

• was ringing

While I _____ (walk) in the streets of Holland, I met an old friend of mine.

• was walking

• walked

• was walked

I _____ (see) the thief while he was getting into my neighbor’s house.

• seed

• saw

• was seeing

While I was texting, the school bus _____ (come).

• came

• comed

• was coming

When I saw them, they _____(play) under a tree in the park.

• were playing

• was playing

• played

Sammy _____ (wait) for us when we got off the plane.

• was waiting

• waited

• were waited

While I was writing the email, the computer suddenly _____ (go) off.

• went

• was going

• goed

While John _____ (sleep) last night, someone stole his car.

• was sleeping

• were sleeping

• sleeped

While I was doing the washing-up, I _____ (break) a plate.

• breaked

• broke

• was breaking