There are over 58, 000 rocky objects in _______ space, about 900 of which could fall down onto _______ earth.
A．the; the B. 不填; the C．the; 不填 D．a; the
The girl had hardly rung the bell the door was opened suddenly, and her friend rushed out to greet her.
A. before B. until C. as D. since
Lots of rescue workers were working around the clock, supplies to Yushu, Qinghai province after the earthquake....
A. sending B. to send C. having sent D. to have sent
Stephen Hawking believes that the earth is unlikely to be the only planet life has develop gradually.
A. that B. where C. which D. whose
——volunteering is becoming popular in China .
——yeah, people are now aware that helping others is helping themselves.
A. naturally B. successfully C. splendidly D. increasingly
When you introduce me to Mr. Johnson, could you please say for me ?
A. everything B. anything C. something D. nothing
