根据句意完成已给出首字母或汉语提示的单词，使补全后的句子意义通顺，语法正确。

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)