单项选择题

When things get difficult, you just have to grit your teeth and persevere _______ your goals.

A. in
B. on
C. with
D. for
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单项选择题
The returns in the short ________ may be small, but over a number of years the investment will be well repaid.
A. interval
B. range
C. span
D. term
单项选择题
The WTO meeting _______ with no agreement on launching a broad round of trade liberalization negotiation.
A. broke off
B. broke in
C. broke up
D. broke out
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