—How long did you do your homework? —______.
| A．Before it struck 10 | B．Since supper time |
| C．So long as I stayed up | D．Until 10 o’clock |
As ________ as the sky is your mind. As deep as the sea is your kindness.
| A．broad | B．aboard | C．abroad | D．board |
No one _______ the building without the permission of the policeman.
| A．is leaving | B．will be leaving | C．has left | D．is to leave |
The new bridge is ________ the one built last year.
| A．three times as wider as | B．three times the width of |
| C．three times the width | D．as three times as |
She ________ down her book and ________ in bed.
| A．laid; lay | B．lay; laid | C．lay; lay | D．laid; laid |
Some researchers believe that there is no doubt _______ a cure for AIDS will be found.
| A．which | B．that | C．what | D．whether |