Scientists are convinced ________ the positive effect of laughter _______ physical and mental health.
| A．of; at | B．by; in | C．of; on | D．on; at |
---John is said to have learned Italian in Italy for five years.
---_______ he speaks it like a native speaker.
| A．No doubt | B．No problem | C．No wonder | D．No curiosity |
Jimmy needs to improve his technique if he _______ gold at the 2012 Olympics.
| A．wins | B．is winning | C．will win | D．is to win |
Everybody’s fingerprints are _______, so the police can easily find the thieves if any is left when they’re stealing.
| A．single | B．particular | C．special | D．unique |
Knowing how long the test would last, the students who finished _______ back and waited until the end of the exam.
| A．settle | B．settled | C．settling | D．to settle |
I thought things would get better, but _______ it is they are getting worse.
| A．before | B．because | C．as | D．after |