How long can you ________ your breath underwater?
| A．hold | B．take | C．keep | D．save |
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 |
To write his paper, he tried hard to collect _______ information as he could.
| A．many of | B．a great many | C．the number of | D．a large amount of |
Don’t worry. You ________ have that book tomorrow.
| A．must | B．could | C．shall | D．may |