請幫我解what kind 英文文法題?

請問以下詳解?~~謝謝~
42 What kind of food--- their company produce?
is does have has
ans:b為什麼是b~不是a~~如何判斷?
43 The construction company must pay to have archeologists--- the historical sites.
study studied studying to study
ans:a為什麼是a??
According to experts, sleep is like 46 . If you sleep only five hours a day, you don’t “get used to it,” but instead, build up a “sleep deficit.” “It’s like a credit card,” says Dr. Mass. “You are only 47 time. You always have to pay it back.” The more hours you don’t sleep, 48 you should sleep to “pay back” the hours on your “sleep credit card.”

47 lending using collecting borrowing

ans:d為什麼不能用a?怎分 ?


40 Wiliam, you----- for three hours already. It’s time you go out with some friends to relax.
are studying studied had studied have been studying
ans:d為什麼是d~

If you hear ringing in your ears or things sound muffled 47 listening, you’ve overdone it. Usually the problem subsides, but listening to loud music regularly, with any type of headset, could 48 permanent hearing loss. Recent research suggests limiting use to an hour or less per day at no more than 60% volume for over-the-ear styles－and even less for ear-buds. Never sleep with them on.
47 at since without after

ans:d為什麼是d~