26. Sue could play ___________ piano at the age of four.
A. a B. the C. 不填
27. Do you know _____________ ?
A. when the train leaves the station B. when does the train leave the station
C. when will the train leave the station
28. If he ______________ on time, we will go without him.
A. doesn’t come B. don’t come C. didn’t come
29. — What did you do last Sunday, Mike ?
— I ______________ on the lake with my grandpa.
A. go fishing B. went fishing C. will go fishing