1.①Can you figure out how he came up with such a good solution to the difficult question？
②She does exercise every day to__keep__her__figure(保持身材).
2.①We’ll support you wholeheartedly in your new experiment.
②I had planned to study abroad, but neither of my parents was in support of this idea.
③Young as he is, he has a big family to__support(support).
3.①Personally, I think store shopping will exist along with home shopping but will never__be__replaced(replace).
②The old building will most probably be replaced by/with a modern sprots center.
③a.If I refuse to go, they will send someone else in__place__of(代替) me.
b.If I refuse to go, they will send someone else to take__the__place__of(代替) me.
4.① a．There have(have) been large quantities of rain in this area in the past two weeks.
b.There has(have) been a large quantity of rain in this area in the past two weeks.
②It’s a lot cheaper if you buy this food in quantity.
5.①To be brief, she was satisfied with the result.
②In brief, the bestseller is well worth reading.
③Tom explained briefly(brief) what to do next.
