21.We'd better hurry ------ it is getting dark.

21.We'd better hurry ______ it is getting dark.A.and B.but C.as D.unless22.I didn' t manage todo it _____ you had explained how.A.until B.unless C.when D.before23._____he comes,we won't be able to go.A.Without B.Unless C.Except D.Even24.I hurried _____ Iwouldn't be late for class.A.since B.so that C.as if D.unless25._____ I catch a cold,I have pain in my back.A.Every time B.Though C.Even D.Where26.What's the matter _____ they still haven't answered the telegram?A.when B.that C.though D.however27.Bring it nearer _____ I may see it better.A.although B.even though C.so that D.since28.You may arrive in Beijing early _____ youmind taking the night train.A.that B.though C.unless D.if29.Helen listenedcarefully _____ she might discover exactly what she needed.A.in that B.in order that C.in case D.even though30.More people will eat out in restaurants _____ they do today.A.than B.when C.while D.as