．Canada, ________ second to Russia in size, is ________ home to all kinds of animals and plants, making it famous for its natural scenery.
| A．不填，a | B．the, the | C．the, 不填 | D．不填，不填 |
The novels written by the author sell best, but five years ago no one could have imagined how great a role hein the literary world.
| A．was playing | B．played | C．was to play | D．had played |
He turned down the request of his friend because it wasthe limit of his power.
| A．beyond | B．over | C．off | D．above |
After driving for five hours, they arrived atthey thought was the place they had been dreaming of.
| A．what | B．that | C．which | D．where |
If you had worked hard, you ______ so anxious now．
| A．are not | B．would not have been | C．will not be | D．would not be |
_____ I’m willing to help, I do not have much time available．
| A．While | B．When | C．Once | D．Since |