The tree _________ are green in spring. A. leafs B. leaves C. leaf
I walked ____ Mike’s home in the morning. A. for B. to C. in
John went to the park ____ bike yesterday. A. with B. by C. on
—What are you doing now ? —I am ____ pictures. A. draw B. drawing C. drew
ZhangPeng ____ his homework now. A. did B. does C. is doing
I was very grateful ____ the dog. A. with B. for C. to