______ trees are cut down in the forests every year.
| A.Thousand | B.Thousands |
| C.Thousands of | D.Thousand of |
— Can you play chess?
— No, but I can play ________ piano very well.
— No, but I can play ________ piano very well.
| A.a ; the | B.the; / | C./; the | D.the; a |