In New Zealand , people live in the houses with their doors ______ north.
| A．faced | B．face | C．facing | D．facing to |
So suddenly ________that the animals in the zoo looked very frightened during the total solar eclipse (日全食)．
| A．did the sky turn dark | B．the sky did turn dark |
| C．turned the sky dark | D．was the sky turned dark |
—Have you finished your book report?
—Not yet. I couldn't________on it with so loud music next door last night.
| A．draw | B．devote | C．direct | D．concentrate |
Once we have________some knowledge, things do not become more difficult, but comprehensible.
| A．required | B．acquired | C．inquired | D．inspired |
The chief editor demanded that the article ________immediately.
| A．must be submitted | B．would be submitted | C．submits | D．be submitted |
Tom is a promising student. I am sure that with his________effort, he will make a very successful scientist.
| A．usual | B．constant | C．content | D．normal |