A.on; inB.on; atC.in; at;D./; at

A. the train leave B. does the train leave C. will the train leave D. the train leaves

A. how did he mend B. what did he mend C. how he mended D. what he mended

--Yes，I did．I quite a lot．

A.saw；seeB.see；sawC.saw；sawD.see；see

what B．how C．whether D．where

A. where it happens B. where did it happen

C. how it happened D. how did it happen

A. what are you doing B. where do you study

C. what you were doing D. what to do it

A.rideB.ridesC.are ridingD.rode

--He went to the zoo．

A.does；doB.is；doingC.will；doD.did；do

A. how far/ had gone B. how long/ has gone

C. how far/ went D. how far / had run