Evidence came up _____ specific speech sounds are recognized by babies as young as six months old.
| A．which | B．what | C．that | D．when |
He ____ have the ticket if I buy it .
| A．will | B．must | C．shall | D．ought |
This car looks like mine , yet it isn''t . Whose ____ .
| A．can | B．could | C．may | D．must |
The work ____ be finished in such a short time .
| A．wasn''t able to | B．couldn''t | C．ought | D．could |
— 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 |
Why ____ you keep troubling your mother with such question while he is busy .
| A．can | B．will | C．would | D．must |