33. Generally speaking, ______ according to the directions, the drug has no side effect.
| A．when taking | B．when taken | C．when to take | D．when to be taken |
There has been a great increase in retail sales , ____﹖
| A．does there | B．isn't there |
| C．hasn't there | D．isn't it |
You ____ him so closely; you should have kept your distance.
| A．shouldn't follow | B．mustn't follow |
| C．couldn't have been following | D．shouldn't have been following |
In fact Peter would rather have left for San Francisco than ____ in New York..
| A．to stay | B．stayed | C．stay | D．having stayed |
Professor Wang , _______ for his informative lectures, was warmly received by his
students.
| A．knowing | B．known | C．to be known | D．having known |
________evidence that language acquiring ability must be stimulated.
| A．If being | B．It is | C．There is | D．There being |