课时作业1
Ⅰ.根据提示写出单词的正确形式
1. We must p________ commerce with neighboring countries.
2. I lost my b________ and fell off the bike.
3. The a________ rainfall is little in the desert, so almost no plant can grow there.
4. It took the fire fighters a long time to rescue the people ________(trap) on the upper floor.
5. Plant the seeds at a ________ (deep) of about 2 cm.
