A

46．How do you learn English？　　

47．What does your friend look like？　　

48．I am flying to Sanya to take a holiday．　　   

49．I think the air will be cleaner in the future．　　

50．Bob，could you please take out the rubbish？　　

B

A．Let's go．

B．Sure，Mom．

C．I agree with you．

D．Have a nice trip!

E．By reading aloud．

F．She's of medium height．