21. Every morning, the fish mongers stood there ______ with the fishermen for fishes.
| A．to argue | B．to talk about prices | C．bargaining | D．Discussing |
Canada is the only country that _____ an entire continent in the world, facing the Atlantic ____ the east.
| A．makes up; on | B．covers; on | C．takes up; to | D．do up; in |
—I am afraid I can’t return the book to you before Friday.
—________.
| A．Don’t be afraid | B．Be careful |
| C．Not at all | D．Take your time |
—Does he often ask you for help?
—Oh，no，only________.
| A．all the time | B．at one time |
| C．at a time | D．at times |
________， I lost heart in English learning，but my teacher often said to me，“Keep on studying hard，and you’ll succeed________.”
| A．At a time；in time |
| B．At a time；on time |
| C．At one time；in time |
| D．At one time；on time |
Will you be home________to see the children before they go to bed?
| A．on time | B．in time |
| C．at a time | D．at one time |