Scientists are convinced the positive effect of laughter physical and mental health.
| A．of; at | B．by; in | C．of; on | D．on;at |
I didn’t get into the two-hour quarrel; I know how it ______, though.
| A．would break out | B．has broken out | C．was breaking out | D．had broken out |
It is no doubt that once ____ this city, you’ll find that there is so much surprise waiting for you to discover.
| A．visit | B．visiting | C．visited | D．to visit |
I really don’t like art, I find his work impressive.
| A．As | B．Since |
| C．If | D．While |
I can’t say which wine is beat—it’s a (n) of personal taste.
| A．affair | B．event | C．matter | D．variety |
Could I speak to is in charge of International Sales , please?
| A．anyone | B．someone | C．whoever | D．no matter who |