29.---Do you know the _____ of the war?---Maybe it ____ by hunger. (cause)

27.His father doesn’t allow him _______ (stay) out late.

28_____ (disturb) your classmate when he is studying is not polite.

26.He was the first boy in his class ____ (have) a camera.

25.Fill in the _____ (miss) words.

24.He walked out ______ (angry) without saying a word.

23.The book is the _______ (value) present of all.

22. The teacher _______ (mark) the papers when we saw her.

21. Jame and Rose watched the football match last night, so they found the match _____(excite).

20. ______ (plan) ahead can help you make work easier.

19.The problem of stress gets ____(bad) when people don’t share their problems.