1．     We have to         visit our grandparents this winter vacation because we miss each other very much.

A. back to                  B. get back                   C. get back to               D. return back

 —Do we have to finish our homework this afternoon?

—Yes, you ________.

A. must             B. can              C. may              D. need

A：Are you going to the school party?

B：Yes, I am.     69    

A：You can’t do that!

B：    70    

A：If you wear your jeans to the party, the teachers won’t let you in.

B：OK, then let’s take some snacks.

A：    71    

B：Really? Why?

A：    72    

B：Oh, I see.    73    

A：Yes, of course . If we don’t have our ID cards, we can’t go to the party.

①Forests help to keep water from running away, so drought does not often happen. The trees in the forests can keep raindrops from hitting the soil directly, and the dead leaves on the ground can also keep the water from running away.②
Chinese people don’t want to see more floods and droughts. We have built the “ Great Green Wall” of trees across the northern part of our country.③ Thanks to the “ Great Green Wall”, we can prevent the wind from blowing the earth away. It will stop the sand from moving towards the rich farmland. That’s why more “ Great Green Walls” are needed. Trees must be planted all over the world.④
根据短文内容，从题中所给的A、B、C、D四个选项中，选择最佳答案。（10分）
【小题1】 “Great Green Wall will make the world better.” This sentence should be put in      .

A：Are you going to the school party?
B：Yes, I am.     69    
A：You can’t do that!
B：    70    
A：If you wear your jeans to the party, the teachers won’t let you in.
B：OK, then let’s take some snacks.
A：    71    
B：Really? Why?
A：    72    
B：Oh, I see.    73    
A：Yes, of course . If we don’t have our ID cards, we can’t go to the party.