根据句意和首字母，写出各单词的正确形式。

小题1:The teacher says I have to learn grammar again because I always make m ___ in grammar.

小题2:Much of the village is c        by snow.

小题3:This problem is very difficult. He can not solve it e_______.

小题4:You will fail your next exam u________ you start to work at your studies now.

小题5:I think he will work out the problem, because he is quite a p         person. 

在开展受托资产管理业务中，证券公司作为（），与委托人签订受托投资管理合同。

A.受托人

B.监管人

C.经纪人

D.受托投资管理人