Sitting at the corner of the meeting room, he looked sad because there were so many problems ________.
| A．remaining to settle |
| B．remained settling |
| C．remaining to be settled |
| D．remained to be settled |
— Do you have to take care of your mother at home ? — Yes , I ____ .
| A．do | B．have to | C．have | D．shall |
— You ought to have called her yesterday . — Yes , I know I ____ .
| A．ought to | B．ought go have | C．ought have done | D．ought to have called |
— Would you please go to the cinema with me ? — Yes , I ____ .
| A．will | B．would | C．could | D．should |
I don''t think it any use taking with him , you ____ as well leave him alone .
| A．might | B．must | C．can | D．could |
Why ____ you keep troubling your mother with such question while he is busy .
| A．can | B．will | C．would | D．must |