Is this______first time you’ve flown on_______British Airways?
A. the;不填 B. the; a
C. a; the D. 不填；a
“Please remain______until the airplane comes to a complete stop.” said the stewardess.
A. seating B. seat C. seated D. to seat
—Why are you so busy these days?
— We_____trees. Why not join us？
A. have planted B. will plant
C. are planting D.planted
After the argument Colin ran away and______since.
A. isnt heard of B. wasn’t heard of
C. hasn’t been heard of D. hadn’t been heard of
The door is open but nobody is in. Mary______have forgotten to lock the door.
A. should B. must C. would D. could
________I like Carter personally, I don’t think what he’s doing is right.
A. If B. As C. While D. Unless
