Lacking _______ evidence, the police couldn’t arrest the man.
| A．ordinary | B．potential |
| C．solid | D．common |
16. After he left college, he was employed in an international company and _______ there ever since.
| A．worked | B．has worked | C．had worked | D．was working |
15. The factory _______ large numbers of tractors to the peasants.
| A．provides | B．supplies | C．ensures | D．stores |
14. The teacher insisted _______ until we finished the work.
| A．we not rest | B．on our resting | C．we rested | D．we would not rest |
13. — How do you keep fit?
— By having a healthy diet and _________ regularly.
| A．turning out | B．working out | C．giving out | D．going out |
12. Having finished their morning work, the clerks stood up behind their desks, ________ themselves.
| A．expanding | B．extending | C．expressing | D．Stretching |