A few years ago, some tourists pay no attention to environmental protection. They threw waste things
about, like plastic bags, fruit skins and waste papers. Sometimes they broke trees, picked up flowers and killed birds; some even made fires in the woods to cook for picnics. What dangerous it was! Fortunate,
great changes have been taken place here. All the tourists have got  used to put their rubbish into dustbins. But they are making great efforts to protect birds and plants as well .They bring our own meals prevent
any accidental fire. All these should be appreciated
______________________________________________________________________________

A. worked  
B. has worked  
C. had worked  
D. work

A. has stayed    
B. stays    
C. stayed    
D. had stayed

A. climbing   
B. his climbing  
C. he climbed    
D. climbed

A. lied; lied; laying
B. lying; lying; laid  
C. lying; lying; laying
D. lying; lied; laid

1. On the way to the station, he ___________(閑聊) about their trip.  
2. At school, they had learned that most Canadians live _______(在……范圍內(nèi)) a few hundred
    kilometers of the USA border.
3. Fruit juices can be ________(有害的) to children's teeth.  
4. Water had also appeared on other planets like Mars but ________(不像) the earth.
5. He has been working on a new _______(小說) recently.
6. Have you ever heard of the saying, 'A friend in need is a friend ________(真正地)'?  
7. It's your fault. Go and ___________(道歉) to her.  
8. He pushed against the rock with all his __________(力氣).
9. It's the _______(習(xí)俗) in that country for women to marry young.  
10. For _______(顯而易見的) reasons, I'd prefer not to give my name.  

A. to came    
B. to come    
C. to coming        
D. to comes

A. missed          
B. had missed        
C. was missing      
D. would miss

     It has been years since the Chinese get plastic bags from supermarkets for free. China has banned
free plastic bags at shops and supermarkets, but people have to pay for them. The Chinese once used
about 300 million of plastic shopping bags a day, which has caused environmentally pollution because
plastic bags are not easy to break down. So the Chinese is encouraged to take their own bags for
shopping. Then what kind of shopping bag is the best to carry? Some student in Chongqing have a
extraordinary idea. They use old clothes to make cloth bags, and then to ask their parents and friends
to use these cloth bags instead of plastic ones. They do so because they think it is our duty to help
protecting the environment.
_____________________________________________________________________________

A. had directed
B. has directed
C. directed
D. directs