Success _________three key factors: diligence, talent and luck, of which the first one is of great importance .
| A．breaks down | B．puts up | C．divides into | D．consists of |
Listening to loud music at rock concerts _____ caused hearing loss in some teenagers.
| A．is | B．are | C．has | D．have |
Such poets as Shakespeare _____ widely read, of whose works, however, some _____ difficult to understand.
| A．are; are | B．is; is | C．are; is | D．is; are |
The factory used 65 percent of the raw materials, the rest of which _____ saved for other purposes.
| A．is | B．are | C．was | D．were |
One third of the country _____ covered with trees and the majority of the citizens _____ black people.
| A．is; are | B．is; is | C．are; are | D．are; is |
—I heard a bus accident happened yesterday.
—The bus crashed. Luckily, only a few passengers aboard were _____ injured in the traffic accident.
| A．slightly | B．approximately | C．exactly | D．gradually |