-- Why do you feel so unhappy?
--Bad luck . When I arrived at the airport, my flight __________.
| A．took off | B．would take off |
| C．was taking off | D．had taken off |
Excuse me, you ________ open the door before the bus stops.
| A．needn't | B．may not |
| C．don't have to | D．mustn't |
—Jack will go to Dalian for his summer holidays. How about you?
—Sorry, I haven't decided ________．
| A．where to go to | B．how to go |
| C．when to go | D．where to go |
—Mr Smith will check our homework this afternoon.
_______ you ________ it?
—Not yet. I'm doing it right now.
| A．Do; finish | B．Had; finished |
| C．Will; finish | D．Have; finished |
—Thank you for providing such useful information for me.
—________．
| A．Never mind | B．My pleasure |
| C．With pleasure | D．All right |
Whenever I see the birds, I'll ________flying in the sky.
| A．think of | B．pick up |
| C．work on | D．dream of |