More than one student________he is________a teacher to them.
| A．thinks; more than |
| B．think; no more |
| C．thought; no |
| D．thinks; more |
The entry point tissue in the very front of eye functions as the window ______ all light has to pass on its way.
| A．which | B．that | C．across which | D．through which |
Misunderstandings arising from lack of social communication, if not ______ properly, may lead to serious problems.
| A．handling | B．being handled | C．handled | D．to handle |
Worldwide markets get tighter and the pain only lasts longer ______ international cooperation is strengthened in no time.
| A．because | B．if | C．unless | D．when |
The situation in Haiti after the earthquake was all in a mess, ______ the increasing number of robbery cases.
| A．causing | B．having caused | C．caused | D．to cause |
Measures must be taken before there is another collapse of the coal mine, ______?
| A．must they | B．mustn’t they | C．is there | D．isn’t there |