Directions: Beneath each of the following sentences there are 4 choices marked A, B, C and D. Choose one answer that best completes the sentence.
21. ____is no doubt ____ Bob can win the first price in the match.
A. There; that B. It; that C. There; whether D. It; whether
22. ________ is of no concern to us.
A. It rain or not B. If or not it rains
C. Whether it rains or not D. Will it rain or not
23. To improve the quality of our products, we asked for suggestions had used the products.
A. whoever B. who C. whichever D. which
24. It never occurred to me _____ you could succeed in persuading him to change his mind.
A. which B. what C. that D. if
25. —Have you finished the book？
—No. I’ve read up to _____ the children discover the secret cave.
