单项选择题

By the treaty each country _________itself to assist the other in case of war.

A．carried
B．guaranteed
C．assured
D．pledged
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单项选择题
Children must learn just a few basic rules - being safe, being _________to others, and being responsible to themselves.
A．thoughtful
B．careful
C．considerable
D．considerate
单项选择题
Nowadays, the computer can be programmed to _________a whole variety of tasks.
A．impose
B．tackle
C．fulfill
D．cope
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