catch up with为“赶上（某人或某事）”，有追上并可能超过的含义。如：
We'll do out best to catch up with the advanced industrial countries.
我们将尽力赶超先进的工业国家。
keep up with作“不落后于（某人或某对手）”解，有与之并驾齐驱的含义。如：
The girls had to run to keep up with the boys.
这些女孩子不得不加快脚步以赶上男孩子们。put up with
1. 忍受，容忍（讨厌的人）
2. 容忍，承受，忍受
3. 忍受，忍耐come up with
想出（计划、回答）；作出（反应）；产生
He couldn't come up with an answer.
他答不上来。
He couldn't come up with an appropriate answer just at the time.
那时他想不出一个合适的答案。
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