What is your mother doing， Linda？
She ___________dinner in the kitchen now．（ ）
A．is cookingB．was cooking
C．cookD．cooking
Please the computer， Lily． It's time for you to go to bed． （ ）
A．turn offB．turn upC．turn on
There are a few towers in Zhuzhou， and the TV tower near the Yandi square is the ．（ ）
A．tallB．tallerC．tallest
______he was poor himself， he tried his best to help the people in need．（ ）
A．BecauseB．ThoughC．After
The last BeiDou navigation satellite （北斗卫星导航） successfully last month．（ ）
A．was sent upB．sent up
C．has sent up
On the phone her father asked her then．（ ）
A．what was she doingB．what she was doing
C．when she was doing