If you are free to walk through out city, please ________ us.A drop in B drop in at C. drop in on
The girl in purple is new here, so ________ people know her.
— I called you yesterday evening, but you were not in . — Sorry, I ________ in the shop with my mother.
Oh, it ________so nice. What beautiful music it is !
I’ll go to visit my aunt in England _____ the summer holidays start..
—How do you like ________color of my dress? —Wonderful! I like it very much.