Many countries are in great need of natural gas, wind and other forms of ________.
| A．power | B．source | C．energy | D．material |
We hope the new machine will work faster, ______ reducing our costs.
| A．however | B．instead | C．thus | D．anyhow |
Mr. Smith soon made _____ clear why he had asked for a conference.
| A．one | B．it | C．this | D．that |
We ______ have class the last week of May, but I’ll let you know for sure as the time approaches.
| A．can’t | B．need not |
| C．mustn’t | D．may not |
Park Geun-hye of South Korea won the presidential election, becoming the first woman ______ the country.
| A．leading | B．led | C．to lead | D．being led |
Jack has behaved in the most extraordinary way; I can’t _______ his actions at all
| A．look for | B．apply for |
| C．care for | D．account for |