We are confident that the environment ________ by our further efforts to reduce pollution.
| A．had been improved | B．will be improved |
| C．is improved | D．was improved |
Laughter, along with an active sense of humor, ______ protect you against a heart attack, according to a recent study.
| A．have helped | B．helped | C．help | D．helps |
To some degree, uncontrolled information from the Internet that many people turn ______ false.
| A．to turn out | B．to turns out | C．turn out | D．turns out |
There are two thousand students in this college, ______ are from the countryside.
| A．one-third of them | B．one-third of which |
| C．one-third of whom | D．one-third in which |
The lazy boy tried to get through the exam without hard work in the way ______ his friend suggested.
| A．in that | B．in which | C．which | D．where |
He has ______ lung cancer for several years and is never _______ pain.
| A．recovered from; away from | B．suffered; away from |
| C．recovered; free from | D．suffered from; free from |