The last exhibition was not ______this one

16. The last exhibition was not ______this one. 

A. as interesting

B. so interesting than

C. as interesting as

D. more interesting

17. Miss Lan ______ a new house last year.

A. buy

B. bought

C. buying

D. has bought

18. The book______ I borrowed from my school library is very interesting. 

A. which

B. whom

C. who

D. where