Since the time humankind started gardening, we _____to make our environment more beautiful.
| A．try | B．have been trying |
| C．are trying | D．will try |
______ that she should come here on time.
| A．Suppose | B．Demand | C．Think | D．Believe |
At no point south of the Han River _______ more than a mile.
| A．the enemy didn’t advance | B．the enemy advanced |
| C．did the enemy advance | D．didn’t |
Only at that time ______ that he had made a lot of mistakes in his homework.
| A．He realized | B．did he realize |
| C．he did realized | D．realized he |
He ______ prison two years ago and now he _______.
| A．was put in; was set free | B．was shut into, is set free |
| C．put into, has been set freely | D．was put into; has been set free |
_______ the two oceans the Pacific is ______ .
| A．In; the large | B．For; larger | C．Of; larger | D．Of, the larger |