21. _____ he works hard, I don t mind when he finishes the experiment.
A. As soon as B. As well as C. So far as D. So long as
22.Although he knew little about the large amount of work done in the field, he succeeded_____ other more well-informed experimenters failed.
A. which B. that C. what D. where
23.I m sure he is up to the job_____ he would give his mind to it.
A. if only B. in case
C. until D. unless
24._____ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
A. Even if B. As far as C. If only D. So long as
25.We ll visit Europe next year_____ we have enough money.
A. lest B. until C. unless D. provided
26.I was advised to arrange for insurance_____ I needed medical treatment.
A. nevertheless B. although C. in case D. so that
27.The trumpet player was certainly loud. But I wasn t bothered by his loudness_____ by his lack of talent.
A. than B. more than C. as D. so much as
28. _____ you are leaving tomorrow, we can eat dinner together tonight.
A. Since B. While C. For D. Before
29.We agreed to accept______ they thought was the best tourist guide.
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