Even if there is no scientific proof secondhand smoke causes cancer, there is no reason why nonsmokers should be forced to take this risk.
| A．which | B．that | C．when | D．where |
--- Would you like to _____ Professor Smith’s lecture this Sunday?
--- Sorry, I have an important meeting to _______.
| A．attend; join | B．join; attend | C．attend; attend | D．join; take part in |
In the police station, I saw the man from ______room the thief had stolen the TV set.
| A．whose | B．whom | C．which | D．that |
We forbid ______ in the lecture hall, so you are forbidden _____ here
| A．to smoke; to smoke | B．to smoke; smoking | C．smoking; smoking | D．smoking; to smoke |
The manager along with his workers _______ day and night to complete the project.
| A．have worked | B．work | C．is working | D．are working |
After a short ________, I got my bag from the thief’s hand successfully.
| A．exchange | B．explanation | C．encouragement | D．Struggle |