基本信息
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21．Up to now, nobody has been able to _____ an explanation of why some people get cancer while some others don’t．
A．put up with B．come up with C．catch up with D．end up with
22．Someone who lacks staying power and perseverance is unlikely to _____ a good researcher．
A．make B．turn C．get D．grow
23．It’s good manners to _____ your seat to an old man or a woman with child．
A．give out B．give off C．give in D．give up
24．In order to _____ a good command of German, Sophia quitted her job and went to study in Germany．
A．require B．inquire C．acquire D．request
25．Having a favorable height is important to a basketball player, because you can get a better ______ over the situation of the ongoing game．
