---Has Tom finished his job yet?
---I have no idea of it; he _____ it this morning.
| A．has been doing | B．had been doing | C．did | D．was doing |
Not only ________ polluted but also ________ crowded.
| A．is the city；are the streets |
| B．the city is；the streets are |
| C．is the city；the streets are |
| D．the city is；are the streets |
Close the door of fear behind you，and you ________ the door of faith open before you.
| A．saw | B．have seen |
| C．will see | D．are seeing |
________ made our school proud was ________ more than 60% of the students were admitted to key universities in 2013.
| A．What；because | B．That；what |
| C．That；because | D．What；that |
If the time is ________ exactly，the paper can be finished on time.
| A．made out | B．figured out |
| C．carried out | D．put out |
—________ you interrupt now？Can't you see I'm on the phone?
—Sorry，sir，but it's urgent.
| A．Can | B．Should |
| C．Must | D．Would |