Many countries are increasing their use of natural gas, wind and other forms of ______．
A．power B．force C．energy D．strength
—How much is the T-shirt ______?
—65 dollars．
A．worth B．cost C．worthy D．paid
I ______ her voice at once on the phone, though we hadn’t seen each other for ten years．
A．heard B．knew C．realized D．recognized
Many children, ________ parents are away working in big cities, are taken good care of in the village．
A．their B．whose C．of them D．with whom
How long do you think _________ the company brings out a new product?
A．it will be before B．will it be until
C．will it be when D．it will be since
________red, the building stands out among the rest and looks very attractive．
A．To paint B．Painting C．To be painted D．Painted
