---Could I have a window seat ?
---All right. Your flight _____ boarding at Gate 18 at 2:15.
| A．have begun | B．began | C． is to begin | D．begins |
A lot of people don’t learn from their mistakes ______ they get hurt.
| A．whether | B．when | C．if | D．unless |
The Russian Railway has _______ the prices of tickets for long-distance trains.
| A．cut down | B．broken down | C．turned down | D．set down |
The winner of the race is tall and thin; he _______ be my friend, Mike, who is short and fat.
| A．might | B．mustn’t | C．can’t | D．should |
To learn how their children are doing at school, parents need to _______ the teachers every now and then.
| A．admire | B．combine | C．gather | D．consult |
—Tom, must you have the light ______ all night? It’s really a waste.—Sorry, I won’t do it again.
| A．burned | B．burning | C．to burn | D．to be burned |