_______ confidence and patience, they failed to settle the difficult problem.
| A．Lack in | B．Lacking of | C．Lacking | D．Having lacked |
We forbid _____ in the reading room. That is, you are forbidden _____ in the reading room.
| A．to smoke; to smoke | B．to smoke; from smoking |
| C．smoking; smoking | D．smoking; to smoke |
The flu is believed________by virus that likes to reproduce in the cells inside the human nose and throat.
| A．causing | B．being caused | C．to be caused | D．to have caused |
-----The room is so dirty. ________we clean it now?
-----Ok.
| A．Will | B．Shall | C．Would | D．Do |
He has always dreamed of getting________money and does not work hard at all.
| A．unforgettable | B．uncomfortable | C．unsuccessful | D．unexpected |
Our goods with a (an) ________of colors and patterns can meet the demand of customers at different levels.
| A．variety | B．category | C．amount | D．species |