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题型：单选题题类：模拟题难易度：普通

Scientists from different countries are trying to_______ a good way to solve the energy problem.

A、keep up with B、come up with C、catch up with D、meet up with

举一反三

Lisa's cat _________ her hat.

It's not polite to make fun of others when they are in trouble .

When you visit a museum, you should ___________ the instructions.

Don't worry. I'll {#blank#}1{#/blank#} (think about, think of) a way.

I need a new jacket. This one doesn't ________ the cold.

The energy from the sun and the wind is very cheap and it will never .

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