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

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

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

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

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

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

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

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

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