Introduction reading
Ⅰ.用所给词的适当形式填空
1．frighten
①He was________at the thought of his huge debts.
②The salesman________the old lady into signing the paper by threatening to take away the goods.
③How do you react when you see something________.
2．sharp
①Be careful! That knife has a________edge.
②A workman must________his tools if he is to do his work well.
3．calm
①She has the ability to keep________in an emergency.
②The two policemen looked about them________.
4．exist
①There________deep friendship between Chinese people and American people.
②I wonder how the human race came into________.
5．unlikely
①Seeing that he's________to come.
②The old are more________to catch a cold than the young.
