Scientists are convincedthe positive effect of laughterphysical and mental health.
A. of; at
B. by; in
C. of, on
D. on; at
—Do you mind my opening the window Its a bit hot in here. —, as a matter of fact.
A. Go ahead
B. Yes, my pleasure
C. Yes, I do
D. Come on
—The research on the new birds flu virus vaccine is challenging and demanding. Who do you think can do the job —my students have a try
A. Shall
B. Must
C. Will
D. May
Because of the financial crisis, days are gonelocal 5star hotels charged 6,000 yuan for one night.
A. if
B. when
C. which
D. since