There are many ways for us to reduce (减少) waste. For example, we can reuse paper and plastic bags. We can also recycle newspapers, glass, and cans (易拉罐)  1new things. Here are some useful 2 to reduce waste.
   Write on both sides of paper
   Many people write on only one side of their paper. Why not try using both sides? Some students only use half the pages of their 3 before getting new ones. Try to use up all the paper. People often give cards on birthdays or festivals. How about trying to 4 e-cards (电子贺卡) instead?
   Don’t throw away your old batteries (电池)
   Maybe you do not know that old batteries make the soil 5. This is because they have poisonous (有毒的) parts in 6. So, don’t throw away batteries. 7 them together. Try to use rechargeable (充电的) batteries for your games and CD players.
Give 8 all your unwanted clothes
   There are many poor families in China. You may ask your mother to keep your unwanted clothes. Then you can pass them on to those poor children. You will feel happy that you are 9 someone else. Also, you can see  10 your friends or relatives (亲戚) want them before throwing them away.

①In order to protect our environment, we can't freely cut trees without the government's ____(允许)．

②There is no ____ (通路) to the street through that door.

③Humor is a more effective ____(防御) than violence(暴力)．

④Now that you are a college student, you should learn to be ____ (独立的)of your parents' help.

⑤Can you give me a ____(明确的)answer by tomorrow?

⑥With his new method, the time of the project will be ____ (缩短)．

⑦They brought the piano ____(斜着地) through the front door.

读西经度半球图（如图），判断下列各题。