—Shall I attend my friend's comingofage ceremony, Mum?
—No, unless you see to ________ that you will be home before 1000 PM.
| A．one | B．this |
| C．it | D．her |
Health experts in many countries still _________ their ideas about the relationships between our food and our health.
| A．have tested | B．tested | C．are testing | D．test |
—Can I help you,sir?
—Yes,I bought this radio here yesterday,but it_________.
| A．didn’t work | B．won’t work |
| C．can’t work | D．doesn’t work |
The last time I _________ her,she _________at a medical college.
| A．was visiting;studied | B．visited;studied |
| C．visited;was studying | D．was visiting;was studying |
—My watch is out of order.
—Then why don’t you have _________?
| A．repaired it | B．to repair it |
| C．it repaired | D．it to be repaired |
I bought the telephone here yesterday but it _________ work.
| A．can’t | B．doesn’t | C．wouldn’t | D．didn’t |