16. On no account() to anyone else.

A. my name must not be mentioned √B. must my name not be mentioned

C. must my name not mention D. my name must not mention

17. Had Christina arrived 5 minutes earlier, she () the train.

A. would catch B. could catch

√C. could have caught D. would be able to catch

18. () I shouted at the top of my voice did Lily turn her head.

A. Until √B. Not until C. It was not until D. Only until

19. Rarely() such a silly thing.

A. I heard of B. have heard I of

√C. have I heard of D. have heard of I

20. () do we suspect that this district is rich in mineral resources.

√A. Little B. A little C. Few D. A few