19.　 The soldiers showed perfect ________(纪律) under the fire of the enemy.

Unit 18

18.　 Don’t b________ your father. He is trying his best to solve the difficult problem.

17.　 Do you know that the Polar Bear lives in a cold ________(气候).

16.　 I was i_________(激励) to work harder than ever before.

15.　 For a few, ___________(奖学金) were sources of support.

14.　 He is so d________(不诚实) that he often tell lies. I couldn’t b_______ his lying.

13.　 Cars on the free way must run above the speed of 70 m______ an hour.

12.　 People often call one who wins the first place c_______.

11.　 Monday, Tuesday and Wednesday are w________ while on Saturday and Sunday you can rest.

10.　 He is c________(快乐) though he is ill.