49. He goes _____ at 8 a.m. and comes _____ at 5 p.m. Today he is _____.
| A．on duty; off duty; on night duty | B．on his duty; off the duty; on night duty |
| C．to duty; from duty; at night duty | D．in duty; out duty; at night duty |
Madam Curie won two Nobel Prizes for her scientific .
| A．observation | B．achievement | C．determination | D．consideration |
The island is about 1,000 feet the coast.
| A．on | B．to | C．from | D．off |
The hunter his gun against the tree and down for a rest.
| A．laid, lay | B．lay, laid | C．laid, lied | D．lied, lay |
These problems are different from each other, so they should be dealt with .
| A．totally | B．simply | C．separately | D．extremely |
－My teacher punished me this morning.
－Why? You’ve done nothing wrong, _________ I can see.
| A．as long as | B．as well as | C．as far as | D．as soon as |