a certain doubt among the people as to the practical value of the project．(D)
A．It has B．They have C．It remains D．There remains
—How is your plan getting along?
—I can’t carry on ________ any longer.Someone must help me.
| A．single | B．simply |
| C．alone | D．lonely |
—Could you ________ take care of my cat while I’m away?
—Sure.Leave it to me，please.
| A．perhaps | B．possibly |
| C．maybe | D．probably |
—How do you find his advice?
—What he said sounded ________，I think.
| A．quite perfectly | B．nice and helpful |
| C．very clearly | D．polite or friendly |
—Be careful not to drop the Ming Dynasty vase.
—Yes，we can’t be ________.
| A．too careful | B．very careful |
| C．too careless | D．careless enough |
Thank god，you finally returned home ________.You can never imagine how I worried about you when I was told about the terrible accident.
| A．safely | B．safe |
| C．separately | D．cleverly |