根據(jù)句意完成已給出首字母或漢語提示的單詞，使補全后的句子意義通順，語法正確。

1．He never tells a lie so he is an h          boy．

2．The question is not very difficult, so we work it out e     

3．Li Lei is a careless boy．He made lots of m        in his exercises.

4．Uncle John o        me a good job last year．

5．The abacus was invented in the sixth c         by the Chinese．

6．We all know the first day of the fourth month every year is      Fool’s Day．(四月)

7．He has         this book for two months．(借)

8．The refrigerator is        ，so please turn it off．(空的)

9．All the children helped their teachers with      ．(愉快)

10．There are 10 foreigners,         three Germans and two Italians．(包括)