A. That; which B. Whether; that C. What; that D. That; what

16. That is ____ paper came into use in China.

A. how B. that C. what D. which

17. It looks ____ we shall have to do the work ourselves.

A. that B. like C. seeming D. as though

18. ____ is not known yet.

A. When she has gone B. Where she has gone C. How did she leave D. Why did she go

19. His suggestion ____ to see the exhibition interested everyone of us.

A. that we go B. which we should go C. that we would go D. when we should go

20. I’ve got to make ____ he told a lie.

A. that clear B. it clear that C. quite clear D. this clear that

21. I remember_______ this used to be a quiet village.