麻烦英语好的朋友帮个忙.11.The thief hid himself in the chimney someone

麻烦英语好的朋友帮个忙.
11.The thief hid himself in the chimney someone should catch him in the act.
a.when b.but that c.lest d.where
12.the European knew what a compass was,the Chinese had put it into practical use.
a.Before long b.Long since c.Long ago d.Long before
13.Put your luggage in the wan quickly the train will be off in a minute.
a.before b.now that c.so that d.unless
14.We left the manager a note he wanted to know where we were.
a.if b.in case c.so that d.unless
15.more than one hundred elements are known,only 25 of them are common.
a.Because b.although c.if d.whether
16.It will not be long man can harness the solar energy and make it serve mankind.
a.since b.before c.when d.after
17.human beings live in great numbers,the waters are very likely to become contaminated.
a.That b.Where c.Even if d.Though
18.He has that it if difficult for him to travel.
a.such heavy a work load b.too heavy a work load
c.so heavy a work load d.much heavy a work load
19.Poor it may be,there is no place like home.
a.although b.as c.how d.that
20.brings about happiness has utility,according to the doctrine of utilitarianism.
a.Anything b.Those which c.Whatever d.That