Cheer up!Scientists may well invent ways _____ these problem

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Cheer up!Scientists may well invent ways _____ these problems.

   A.to solve        B.solving         C.solved      D.solves
   2.There was a basketball match at Jinxing Middle School _____ last Sunday morning.
   A.in                  B.on                C.at              D./
以上两题,请为我解答并写出这样做的原因,希望擅长英语的朋友们帮帮忙,

A.动词不定式做后置定语,修饰way,一般way后面的定语是to do 或者 of doing
D.时间前面有last this that 等词时不用介词

Cheer up!Scientists may well invent ways _____ these problem cheer up/cheer for cheer up+? Cheer up These scientists are working hard to make our country _____. There are many ways of _____ out the problem. cheer up 和cheer on cheer everyone up?cheer up everyone? cheer sb.up 还是cheer up sb. cheer him up还是cheer up him? Cheer up!Everyone may have periods in their lives ____ every She thought a dog might cheer me up为什么用might不是may