873.Remember to _____ a good state of mind even if you should fail plenty of times.

A.take up

B.brush up

C.get up

D.keep up

874.He has left out the most important reason why he ___ last night.

A.stayed up

B.put up

C.picked up

D.kept up

873.答案是D;

考查动词与up构成的习惯搭配。keep up a good state of mind保持良好的心态。

874.答案是A;

考查动词短语的用法。句意:他遗漏了他昨晚为什么熬夜这一最重要的原因。stay up熬夜;put up张贴；支起;pick up捡起;接收;偶然得到或学会等;keep up保持。