Much more attention should_______ when we have exams.

A. pay to                  B. be paid to           C. be paid      D. pay

More and more students _________ too much homework and they are really tired of it.

1. A.
   complain about
2. B.
   care about
3. C.
   learn about
4. D.
   hear about

More and more students _________ too much homework and they are really tired of it.

More and more Americans are going to work by bike. Do you know why more people are  41   bikes to work? We can answer the question in  42  ways. First, bikes don’t need gasoline (汽油), so it takes  43  money to use them. Second, a bike doesn’t  44 much space (空间), so it is  45 to find a                   place for it. And riding a bike is good for one’s  46 . People often drive their  47 to offices or to shops, but now people think riding bikes is a good way of doing sports.
That’s  48  more Americans are now riding to work  49  bike, and they are  50  their own cars at home.