29. _____ you may have, you should gather your courage to face the challenge.

28. I thought of him as my best friend until he ______ to the boss.

27. --- I know this is the latest type but it is second ---hand.. ＄20---that’s my last offer.

　--- Ok. It’s a(n)_______.

26. ______we’ll be able to drive a car______ by electricity, solar energy in about ten years.

25. The chickens will provide us _______ feathers, ______ we can make use for cleaning the table and benches.

24. --- This book by Tony Garrison is of great use for our course.

　 --- But I think his latest one is______ worth reading.

23. --- My son is addicted to drugs. He isn’t hopeless, is he?

--- Yes, ______ he mends his way and starts all over.

22. The ancient Chinese vases _______ display attracted lots of experts and collectors, some of whom suggested they______ on the next fair.

第一节：单项填空(共15小题；每小题1分，满分15分)

21. Although their new factory building is still under ________ construction, we have already placed _______ order for 200 pairs of shoes.