1. There is __________ “u” and __________ “n” in the word “curtain”.

A. a; a                     B. an; an              C. a; an                   D. an; a

2. —What do you think of the film?

—It’s boring. It’s __________ one that I have ever seen.

A. the most interesting                        B. the least interesting

C. more interesting                             D. less interesting

3. You will find __________ useful to have support teams during the walk.

A. it                     B. it’s                 C. that it is                 D. All above