Today people can use the phone to talk with others almost anywhere on the earth. But  31 you use the phone, you can’t see the person you are talking with. That  32  change in the future.
Now some people are using a kind of telephone called the picture phone or a vision phone(视频电话). Two people  33  are talking can see each other with it.
Picture phones can be useful when you have  34  to show the person you are calling. They may have other uses in the future. One day you may be able to ring up a   35  and ask to see a book. Then you’ll be able to   36  the book over your picture phone. Also you may be able to do shopping through your picture phone. If you see something   37  the newspaper that you want to buy, you can 38  the shop. People at the shop will show you the thing you’re   29  in over the phone. You’ll be able to shop all over the town and never even leave your room.
The picture phone is really a   40  phone. More and more people will use it.
A. if                         B. when                C. before  
A. can’t                      B. must                 C. may 
A. whom                     B. who                  C. which  
A. something                  B. nothing               C. everything
A. shop                      B. school                C. library 
A. read                       B. see                   C. watch  
A. in                         B. about                 C. on  
A. visit                       B. go                    C. call
A. interested                   B. bored                 C. interesting 
A. useless                      B. helpless               C. helpful