用括号中所给词的适当形式填空。
（1）________（sudden）the thief rushed out of the store and tried to run away．
（2）It’s snowing________（heavy）．Let’s go and make a snowman．
（3）They didn’t say anything．Everyone was in________（silent）．
（4）He fell________（sleep）．Don’t wake him up．
（5）The man refused to tell me the________（true）．