1.In time of serious accidents,____ we know some basic things about first aid,we can save lives.
A.whether B.until C.if D.unless
2."You can't have this football back_______ you promise not to kick it at my cat again," the old man said firmly.
A.because B.since C.when D.until
3.-Where's that report?
-I brought it to you ____you were in Mr.Black's office yesterday.
A.if B.when C.because D.before
4.Leave your key with a neighbor ____you lock yourself out one day.
A.ever since B.even if C.soon after D.in case
5.The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.
A.after B.before C.since D.when
6.All of the flowers now raised here have developed from those ___in the forest.
A.once they grew B.they grew once
C.that once grew D.once grew
7.These houses are sold at such a low price _______ people expected.
A.like B.as C.that D.which
8.Is this the reason ____ at the meeting for his carelessness in his work
A.he explained B.what he explained
C how he explained D.why he explained
9.Along with the letter was his promise _______ he would visit me this coming Christmas.
A.which B.that C.what D.whether
10.Doris' success lies in the fact ___ she is co-operative and eager to learn from others.
A.which B.that C.when D.why
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