In order to have _____ better understanding of the accident, the three witnesses were called for _____ second meeting．
| A．a; a | B．the; a | C．a; 不填 | D．不填; the |
Years ago we didn't know this, but recent science ______ that people who don't sleep well soon get ill.
| A．showed | B．has shown | C．will show | D．is showing |
Since I won the big prize, my telephone hasn't stopped ringing. People ____to ask how I am going to spend the money.
| A．phone | B．will phone | C．were phoning | D．are phoning |
John ___ be a basketball player.He’s much too short.
| A．may | B．mustn’t | C．can't | D．should |
See who’s there! ____ it be Mary?
| A．May | B．Must | C．Can | D．Will |
“Can I take it away?” “You ___ better not.”
| A．should | B．could | C．would | D．had |