When _________ where he had put the book, he kept silent.
| A．ask | B．asking | C．to ask | D．asked |
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 |
Nearly all educators believe that a challenging situation can often _______ the best qualities of a person.
| A．bring out | B．bring forward | C．bring about | D．bring up |