I was deeply impressed with the man’s willingness ______.
| A．by chance | B．to take chance | C．to take chances | D．taking chances |
Taking physical exercise regularly is an effective way to avoid ______ with the flu.
| A．to infect | B．infecting | C．to be infected | D．being infected |
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 |