Planting trees good for us.
A. am B. is C. are
（）You are back ________China!
A.Where B. What C. When
（）Yesterday I went to the zoo _____Sam and Amy.
A.onB. in C. with
（）They went there ____plane.
A.on B. byC. with
（）Did you _________to the Huangpu River?
A. go B. went C. goes
找出不同类的单词。
（）（1）A.went B. see C. met
（）（2）A.visit B. ground C. city
（）（3）A.finish B. run C. dropped
（）（4）A.park B. friend C. bought
（）（5）A.train B. came C. plane