—Could I surf the Internet for twenty more minutes, Mum?
—Oh, dear, if you________.
| A．must | B．can | C．may | D．should |
By the time my parents reached home yesterday, I _____ the dinner already.
| A．had cooked | B．cooked | C．have cooked | D．was cooked |
You should make it a rule to leave things ______ you can find them again.
| A．when | B．where | C．then | D．which |
Heasked_______ any elephants in the zoo the day before.
| A．if did you see | B．if you had seen | C．whether did you see | D．that you had seen asked |
Kathy _______ a lot of Spanish
by playing with the native boys and girls.
| A．picked up | B．took up | C．made up | D．turned up |
She wanted to go to the disco, _____, her parents told her not to.
| A．instead | B．but | C．however | D．while |