50．Which one means “You can’t take photos here”?

49．--We should love animals．

--         ．They are our friends．

A．I disagree            B．I agree                    C．I don't think so       D．I’m afraid not

48．My little dog is lost．All of my friends are helping me to           it．

A．look at                B．look for                  C．look after               D．look like

47．The telephone           by Bell in 1876．

A．invent                 B．invents                   C．was inventing         D．was invented

46．--Were you at home at 9 o'clock last night'?

--Yes，I           a shower at that time．

A．took                    B．was taking                     C．was taken               D．am taking

45．          he comes back, I'll tell him．

A．Where                 B．How                       C．When                    D．What