Could you tell me____？
You will stay with an English family and take part in their daily life．（ ）
A．when I should pay for the course
B．what the best part of the course is
C．how long the shortest course lasts
D．where I can go sightseeing after class
The policeman told the children ______ in the river.It's too dangerous!
A．to not swimB．not to swim
C．not swimD．not swimming
—______ do you go to the school library？
—Twice a week.
A．How longB．How oftenC．How soonD．How much
Mary shut the window just now ______ she could keep the insects out.
A．so thatB．whenC．tillD．after
This year's Beijing Music Awards will be covered ______ on Sunshine TV this Saturday.
A．livelyB．aliveC．livingD．live
—Mum，where is David？
—He ______ to see the science fiction film Back to the future.
A．is goingB．goesC．has goneD．was going