--- What are these? --- ______ potatoes.A. It's B. They're C. I'm
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
Did Lucy ____ the noodles yesterday ? cooking B. cook C. cooked