Ⅰ.单词语境记忆——根据英汉提示写出单词的适当形式
1．The robbers disguised(装扮) themselves as security guards.
2．There was a fire in our street，but no one was harmed(伤害)．
3．We need a foreign policy that is more flexible(灵活的)．
4．He was ill，and therefore(因此) could not come.
5．As soon as he entered，he sensed a tension(紧张) in the air.
