In1964, Yuan Longping discovered a natural hybrid rice plant _______.Since then, he has spent all his life increasing the production of rice.
A.at ease B.by chance C.in turn D.on purpose
According to a recent research, some of the small islands around the country may disappear _____ the effects of climate change.
A.except for B.along with C.instead of D.due to
You should book your flight about two or three weeks _____ so that you can enjoy a lower price.
A.in particular B.in advance C.in return D.in fact
—Did you plan to meet here?
—No, .
A.by accident B.by mistake
C.by the way D.by reason
If you keep on, you’ll succeed _____. Wish you success in the exam.
A.in time B.at one time C.for the same time D.sometimes
The chairman remained silent ______ the whole debate.
A.from B.while C.with D.throughout
