The world of out-of-doors is full of secrets. And they are so interesting that quite a lot of people are busy studying them. All around us are birds, animals, trees and flowers. The facts about how they  1  and grow are as interesting as anything could be. Do you know that one of the greatest presidents of the USA spent hours and hours  2  birds? A businessman who lives near New York city became so  3  in insects that he began to collect them. He now has more than one thousand different kinds carefully  4  in glass boxes. Come then with me, and I will help you find some of nature’s secrets. Let us go  5  through the woods and fields. Here we shall find how a rabbit tells the other rabbits that there is danger. We shall  6  a mother bear and her young ones as they look for  7  and get ready for winter sleep. We shall watch bees dancing in the air to let other bees know  8  they can find food. I will show you many other interesting things, but the thing that I can  9  you is to keep your eyes and ears  10  when you go out of doors. Nature tells her secrets only to people who look and listen carefully.

.---It’s a fine day. Why don’t you go camping with us?

----________.  Let’s go.

A. It’s difficult.        B.No, thanks.  

C. Sounds fun.             D. Sure, you can

( Da Wei comes across Li Lei, who is studying, in the school library. )

A: Hi, Li Lei. Are you busy with your homework now?

B: Oh, yeah, Da Wei. And you?

A: I'm here for a book. Hey, Li Lei. Have a break! We should be outside in the fresh air. It's good for us.

B: Sorry, I can't.    66      I must hand it. in tomorrow.

A: Oh, I see. But we can't always stay indoors.  We must often take exercise.    67  

B: Never.  I hardly have time now.  A sea of homework almost takes up all my free time.  It's sad but that's life.    68   

A: You mean my life? In fact, I'm also very busy like you. But you know I like sports.    69      When ever I have a little time, I will try them.

B: No wonder you are so energetic.

A: Yeah, better health, better grades.     70   

B: Yes, you are right.  It sounds as if should also try to exercise often in the future.  Da Wei, shall we play basketball for a while now?

A: OK. Let's go!

     A. How about your life?

     B. I like jumping, running, playing basketball and so on.

     C. Why not walk in the fresh air?

     D. How often do you exercise?

     E.. Do you agree with me?

     F. I have to finish my homework first.

     G. Sounds like great fun!

( Da Wei comes across Li Lei, who is studying, in the school library. )
A: Hi, Li Lei. Are you busy with your homework now?
B: Oh, yeah, Da Wei. And you?
A: I'm here for a book. Hey, Li Lei. Have a break! We should be outside in the fresh air. It's good for us.
B: Sorry, I can't.    1     I must hand it. in tomorrow.
A: Oh, I see. But we can't always stay indoors.  We must often take exercise.    2  
B: Never.  I hardly have time now.  A sea of homework almost takes up all my free time.  It's sad but that's life.   3   
A: You mean my life? In fact, I'm also very busy like you. But you know I like sports.    4     When ever I have a little time, I will try them.
B: No wonder you are so energetic.
A: Yeah, better health, better grades.     5   
B: Yes, you are right.  It sounds as if should also try to exercise often in the future.  Da Wei, shall we play basketball for a while now?
A: OK. Let's go!