1. There was a complete silence when he _______ the radio.
A. has turned off B. turned off
C. had turned off D. would turn off
2. -Where have you _______? We have been looking for you everywhere!
-I ______ the supermarket.
A. been to; have been to B. been; went to
C. gone; have gone to D. been in; went to
3. I'm one of the boys ____ never late for school.
A. that is B. who are C. who am D. who is
4. –Jack, join us in the game!
-OK. Could you tell me ________ it is about?
A. which B. what C. how D. why
5. We'll go to visit Tian'anmen Square ______ it doesn't rain tomorrow.
A. if B. as soon as C. when D. since
