A man flown to a time zone different by 10 hours will ________ eight days to readjust his palm sweat.
本题需要填入一个表示“花时间”而又能与动词不定式连用的动词。spend常用于spend…doingsth.的句型中。cost一般用于itcostsb.…todosth.的句型中，主语不能是人。pay表示“花钱”的意思。只有take可用于sb.take…todosth.的句型中。
As activity carried ________ as one thinks fit in one’s spare time, leisure has several functions.
此题考查对关于carry的短语的掌握情况。carryon继续(做某事);carryout进行，实行，落实;carryoff赢得;carryover将某事延后。
The newspaper will have to close down if it cannot increase its ________ considerably.
circulation：(书报杂志的)销售量，发行额，销路。符合句意。
They will get the preparation done early in May.
首先需要注意earlyinMay表示“五月初”的意思，选项A“让别人准备完”这种表达是不准确的;此外getthepreparationdone表示的是“把准备工作做完”，选项B的表达不是很准确。
Even with the new development in research, only a tiny ________ of all tests are done without using animals.
本句的意思是：“即使研究有了新的发展，只有一小部分的试验可以不用动物”。因此答案为D。variety和plenty分别表示“多样”和“大量的”，意思不合适。amount后只能接不可数名词，而test是可数名词。
There was so much noise that the speaker couldn ’t make himself ________.
makesbdone:使某人被…句意：嘈杂声那么大，以至于听众无法听清演讲者的话。
They ________ extensive and possibly dangerous actual flight training.
句意：他们经历了大量的并且可能是危险的实际飞行训练。
—Why didn ’t you buy a new car?
—I would have bought one if I _______ enough money.
第一个had是过去完成时，第二个had表示“有”。
Don’t trust everything ________ you have read in the newspapers.
In our department, every student _________ after-school activities.
________, what could we do?