4. —You’11 get         shock if you touch         live wire with that screwdriver(螺丝起子). Why don’t you get         screwdriver with         insulated(绝缘的)handle?
5. — I’m not         wage-earner; I’m         self-employed man. I have          business of my own.
—Then you’re  not         worker; You’re         capitalist!
6. —I have         hour and         half for lunch.
—I only have         half         hour — barely         time for         smoke and         cup of coffee.
7. It travels at just under         thousand miles         hour.
8. I have never known such         hot weather.
EXERCISE 3
Insert a or an where necessary:
A．
1. I had very bad night; I didn’t sleep wink (眨眼；打盹).
    2. This man has honesty that we all appreciated.
3. Mr. Brown had vision of new and happier Europe.
4. It’s time you had holiday. You haven’t had day off for month.
    5. There is hourly service of buses in this route.