1.He is very old，______he still works very hard.
A.but B.if C.when D.as
2.______you are dismissed.
A.Neither you go nor B.Either you go or
C.Whether you go or D.Both you go and
3.They had camped once before，______they knew what to take.
A.because B.now C.so D.since
4.Why these things happened was ______the driver had been careless.
A.because of B.owing to C.due to D.that
5.Although，it’s raining，______are still working in the fields.
A.they B.but they C.and they D.so they
6.______we have satisfied you，you have no grounds of complaint.
A.So B.Since that C.Now that D.By now
7.Write clearly ______your teacher can understand you correctly.
A.since B.for C.because D.so that
8.You’ll miss the train ______you hurry up.
A.unless B.as C.if D.until
9.Francis did the task______his brother.
A.as good as B.as better as C.as well as D.as best as
10.The size of the audience，______we had expected，was well over twenty thousand.
A.as B.what C.that D.whom
11.I thought he hated the TV.You are right，______he still watches the program.
A.yet B.besides C.also D.then
12.It looks ______it’s going to rain.
A.that B.as C.as if D.like that
13.______to New York，her father has not heard from her.
A.Because she went B.After she went
C.When she went D.Since she went
14.______he daydreamed，Peter saw figures in the sky.
A.Until B.Since C.While D.During
15.We arrived at the station ______the train had left.
A.after B.before C.since D.when
16.______he was in poor health，he worked just as hard as everyone else.
A.But B.Although C.Even if D.If
17.Give me one more minute ______I’ll have finished.
A.so B.until C.and D.when
18.The worker hunted for jobs in New York for months，______he could not find any work.