choose a or b to indicate the correct sentence : chọn a hoặc b để cho biết câu đúng
47. A. how about putting a picture on the wall?
      B. how about to put a picture on the wall?
48. A. the clock is among the photo.
      B. the clock is between the phot
49. A. let's go to the department store to buy some things.
      B. let's going to the department store to buy some things.
50. A. there are a table and four chairs in the middle of the room.
      B. there is a table and four chairs in the middle of the room.