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第1题

Difficulties are nothing______ we are not afraid of them.
A.even if
B.if
C.less
D.whether
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第2题

The doctor will not perform the operation____it is absolutely necessary.
A.so
B.if
C.for
D.unless
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第3题

______it was already dark, they went on working in the fields.
A.If
B.Whether
C.But
D.Though
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第4题

Of all the workers in this workshop, John works______.
A.more careful
B.more carefully
C.most careful
D.mo
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