用所给动词的正确形式填空：
1．A hole _________ (dig) and a young tree ___________ (put) into it last week.
2．Quite a few too fast cars ________ (stop) by the policeman.
3．John ________ (draw) every evening after supper, but he_____ (not draw) at the moment.
4．Tom_______ (make) some good friends since he __________ (come) to our school.
5．A thermos___________ (use) for_________ (keep) water hot.
6．— When _________ your school __________ (build)?
— In 1988.
7．The boy ________ (make) _________ (work) for 12 hours a day.
8．She ________ (ask) _______ (take) part in my birthday party yesterday evening.
答案：
1．was dug, was put (用被动结构，注意时态。)
2．were/have been stopped (可用一般过去时态，也可用完成时态，但要用被动语态，因为是“被警察拦住了”。)
3．draws , isn't drawing (“每天画画”用一般现在时；“此刻没画”用现在进行时。)
4．has made; came(句中有since是现在完成时的标志，在since引导的时间状语从句中用一般过去时态。)
5．is used; keeping (考查被动语态：开水瓶是用来给水保温的。)
6．was; built (根据句子意思应用过去式的被动语态。)
7．is made to work (考查动词make在被动语态中的使用：在主动语态中“使某人做某事”用make sb. do sth.；但在被动语态中“某人被迫做某事”应用sb.be made to do sth.。）
8．was asked to take （“被邀请参加”用被动语态。）
