Is it a wonder that _____ little cells can store _____ much energy?
Most of the wood ___ to make furniture.
My trousers are too old. I’ll have to buy ___.
40. — I’m afraid I failed in the contest.— _______. At least you tried.
39. _______ is certain, people’s living conditions in China have improved a lot since the 1980s.
38. Li Ming, as well as some of his classmates, ______voluntary work now.