Many countries are increasing their use of natural gas, wind and other forms of __________.
| A．energy | B．source | C．power | D．material |
Do you think the reason _______ he gave is believable?
| A．when | B．why | C．what | D．which |
Thank you for your timely help, otherwise we _______ in great trouble now.
| A．are | B．would have been |
| C．would be | D．were |
_______ apple four hundred years ago led to the law of gravity while _______ apple designed by Steve Jobs has changed our life greatly.
| A．The; an | B．An; an |
| C．An; the | D．The; 不填 |
One more month，______these baby birds will fly out of their nest.
| A．or | B．and | C．but | D．otherwise |
—Excuse me, could you tell me the way to the British Museum?
—Sorry, I’m a stranger here.
—_______.
| A．Thanks, anyway | B．It doesn’t matter |
| C．Never mind | D．No problem |