21.Volunteering gives you a chance lives, including your own.(A) change(B) changing(C) changed(D) to
21.—Look at those clouds!—Don’t worry. ______ it rains, we’ll still have a great time.(A) Even if (B
21.Experiments of this kind ______________in both the U. S and Europe well before the Second World W
21.John promised his doctor he ________ not smoke, and he has smoked ever since.(A) might (B) should
21.This washing machine is environmentally friendly because it uses _____ water and electricity than
21.It is often said that ______ teachers have ______, very easy life.(A) 不填;不填 (B) 不填;a(C) the ;不填 (
21.I invited Joe and Linda to dinner, but ______ of them came.(A) neither (B) either (C) none (D) bo
22. By the time you have finished this book, your meal ______ cold.(A) gets (B) has got (C) will get
24. Jerry did not regret giving the comment but felt ______ he could have expressed it differently.(
26. When deeply absorbed in work, ______ he often was,he would forget all about eating or sleeping.(
28. Many people have donated that type of blood; however, the blood bank needs _____.(A) some (B) le
29. —Have you heard about that fire in the market?— Yes, fortunately no one _____.(A) hurt (B) was h
30. Our friendship _____ quickly over the weeks that followed.(A) had developed (B) was developing(C
31. ______ at the door before you enter my room, please.(A) Knock (B) Knocking (C) Knocked (D) To kn