The science of computer, _____rapid progress has been made in recent years, is the most important of all science.
My friend Martin was very sick with a strange fever; ________, he could neither eat nor sleep.
Car control is a topic _________ Beijingers have argued for a long time.
The _______ of large supermarkets, such as Lianhua Supermarkets, has sounded the death knell(钟)of the local shops.
—Flight CA 581_____________. I must be off now. —Have a nice trip.
—Why are those people gathering in the middle of the street?—I don’t know. There ________ be an accident.