根据句意和首字母提示，补全各小题单词。

小题1:Please give me a hand. I’m not tall e_________ to reach the book on the top of the bookshelf.

小题2:We must f__________ the teacher’s instructions when we are in the lab.

小题3:He has some t__________ understanding what his teacher says because of his poor English.

小题4:It is usually very hot in June, but s__________ it can be cool.

小题5:Don’t disturb him. He is busy w__________ an important report.

湿藏法贮藏种子细沙的湿度一般在（）为宜。

A.0

B.10%～20%

C.40%～60%

D.80%～90%