Teachers’ advice of ______ stress over the school days must be granted by the headmaster.
| A．students to reduce | B．students reducing |
| C．students reduced | D．students being reduced |
— ____ I go out to play now , Mum ? — No , you ____ .
| A．May ; shouldn''t | B．Can ; needn''t | C．Must ; can''t | D．May ; must |
Help me with this suitcase , ____ you ?
| A．don''t | B．will | C．do | D．shall |
Why ____ you keep on troubling me with such questions while I''m busy ?
| A．could | B．can | C．must | D．will |
____ tennis every day ?
| A．Did you used to playing | B．Did you use to play |
| C．Use you to play | D．Used you play |
I saw him leave the office an hour ago . He ____ at this time .
| A．mustn''t be working | B．can''t be working |
| C．can''t work | D．may not being working |