Unit 3课堂练习题（一）
Lessons 13—15
Lesson 13
I.根据括号中所给的汉语用适当的词语填空。
1. It’s _____________（必需的）to help the poor.
2. Is there anything _____________（严重的）with your uncle?
3. Danny ___________（挂）his clothes on the line just now.
4. _____________（安全）is the most important thing at present.
5. Please be ___________（小心的）when crossing the street.
II. 根据句意用适当的介词填空。
1. Jenny is scared ___________ walking in the dark.
2. Tony put the ladder ____________ the wall and climbed up.
3. There is a little window ___________ top of the house.
4. Li Ming, what happened ___________ you this morning?
5. They’ll have a meeting in this hall and we are cleaning it ________ the meeting.
