1.Thanks to your help，we finished the task ahead         schedule.

2.In the end，one suggestion seems to be the solution             the problem.

3.My father quit              (drink)owing to his poor health.

4.Diet and exercise are                  (obvious) important.

5.Eye doctors recommend that a child's first eye exam                  (be) at the age of six months old.

6.Only thirty students                       (graduate) in Chinese last year.

7.We should train our students to speak English                    (fluent) and accurately.

8.Some students will easily get                 (confuse) with all kinds of adverbials.

9.It is a rare and                      (confuse) situation, and no one can explain it.

10.Lucy has achieved all of the goals she set for herself in high school and is ready for new             (challenge) at university.

11.—Do you think it's a good idea to make friends with your students?

—                       (actual)，I do.I think it's a great idea.

12.This river is seriously polluted and is not                     (suit) for any fish to grow in.

13.She is quite content                (stay)at home looking after her children.

14.The majority of the people seem to prefer                         (watch) games to playing games.

15.Schools need             (volunteer) to help children to read.