The last BeiDou navigation satellite (北斗卫星导航) successfully last month.( )
A.was sent upB.sent up
C.has sent up
I was surfing the Internet my brother was doing his homework.
She has studied in this school she was seven years old.
While Helen _____ along the river after supper, she ____ a wallet lying on the roadside. A. was walking; was finding B. walked; found B. walked; was finding D. was walking; found
____________ he exercises every day, _____________ he is very healthy. A. Because; / B. Because; so C. Though; /
(2014)--- Can I use the bike_______ you bought yesterday? --- Certainly. A. what B. which C. who