二、单项填空(每小题1.5分，满分15分)

16. The volunteer teachers in the village are ____ ___college students.

A. regularly    B. nearly     C. clearly    D. freely

17. —Can a plane fly  _______the Atlantic Ocean?

—Yes, but it needs to go _______the clouds for hours.

A. across; through        B. through; across

C. across; across         D. through; through

18. —Mr Hu, can you tell us how to learn maths well?

—Sure. But remember nothing can be learned _______ hard work.

A. by     B. at      C. without   D. for

19.Please try _______late for school next time.

A. to not be    B. not be     C. not to be   D. to be not

20. _______，he decided to send the sick child to hospital.

A. To the end   B. In the end    C. At the end   D. By the end

21.They got up early _______they could catch the early bus.

A. because    B. until     C. so that    D. that

22.Can you show me_______ an e-mail, please?

A. how to send   B. what to send   C. when to send  D. how send

23.—I hear Tom is working at history very hard.

—I’m _______he will pass the history exam this time.

A. afraid    B. surprised    C. sure    D. sorry

24.To keep the classroom clean, please _______waste paper whenever you see it.

A. throw away   B. pick up    C. put up    D. send up

25. We can get fresh water from rain, from rivers, or from _______the ground.

A. across    B. under     C. over    D. off