The product was attacked when it was first（） , but gradually it was accepted.
A. advanced
B. occurred
C. appeared
D. challenged
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According to the author, competition differs from conflict in that______.
A. it results in war in most cases
B. it induces efforts to expand territory
C. it is a kind of opposition among social entities
D. it is essentially a struggle for existence
He must have overslept, or he （） then.
A. would have been here
B. had to be here
C. should be here
D. would be here
I went to the bank to （） my dollars （） pounds.（）
A. converse…into
B. convey…into
C. convert…into
D. convence…into
The mother tried to look calm at the sad news, but the moment she started to speak, she （） .
A. displayed herself
B. delayed herself
C. betrayed herself
D. strayed herself
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