[单项选择]Knock______the door before you enter the room.
A. on
B. for
C. at
D. in

[单项选择]Knock ______ the door before you enter the room.
A. on
B. for
C. at
D. in

[简答题]visiting place you never visit before or place you have visited

[单项选择]— You haven't played with Mike before, have you
— No, I haven't.
— And you think you______ , don't you
A. would win
B. will win
C. win

[填空题]Before (enter) ______, Holmes made an examination of the door.

[单项选择]If you had made good preparations before, you ______ about the coming examination now.
A. would not be worried
B. would not have worried
C. could not be worried
D. could not have been worried

[单项选择]（）you start to feel worse than before, you will need to go to the hospital
A. As  
B. Had   
C. Should   
D. Would

[单项选择]

You really have to get very old before you realize you’re old. I’m in my middle fifties and I don’t feel old yet. However, sometimes I look back at my childhood and (21) things to the way life is for (22) kids. Some things have certainly changed.
One area of change is television. Some changes have been improvements. Some changes, on the other hand, have been (23) .
When I started school, most people didn’t have a television; TV was just beginning to get (24) . My father decided to go all out and buy a 16 inch black and white Motorola set, I still remember watching the Lone Ranger save people from the (25) guys on that awesome electronic machine. That was exciting!
Now, (26) have larger pictures in full color. The pictures are clearer and the sound is much more realistic. The new high definition sets are made to rival (27) screens.
The variety and quantity of programming hasA. today
B. yesterday
C. tomorrow
D. poor