As there is less coal and oil, scientists are exploring new ways of making use of _____ energy, such as sunlight, wind, and water for power and fuel.
一Professor Li, ______the student start at once or wait a while? 一At once.
Those who are not active or______ diet is high in fat will put on weight quickly.
He is kept in the dark and is not _______ that the company is losing money.
You’d better sit in ______ front of the bus so you can have ______ better view on the way.
Don’t always believe him. Sometimes _____ he does is quite different from what he says. A what B that C how D who