5. He will never _______ though every means ________ tried already.
| A．lose heart; has been | B．lose heart; have been |
| C．lose his heart; was | D．lose his heart; had |
-Where is Jim? He said he would meet me here at 3 ： 00 pm.
-He seems __________ with Mr. Black in the office.
| A．to talk |
| B．to be talking |
| C．to have talked |
| D．talking |
The boy seems __________ a lot of books, for he knows so much.
| A．that he has read |
| B．to read |
| C．has read |
| D．to have read |
He is so addicted to smoking that __________ seems to be no chance of talking him into quitting.
| A．this |
| B．what |
| C．it |
| D．there |
The Roman Empire __________ for several centuries.
| A．exists |
| B．existed |
| C．was existed |
| D．is existing |
-How long has the United Nations __________？
-__________1945.
| A．come into existence; In |
| B．been in existence; Since |
| C．been in existence; From |
| D．come into existence; For |