On returning from work, _____.
| A．John found a letter in the mailbox | B．a letter was found in the mailbox |
| C．a letter was in the mailbox | D．the mailbox had a letter in it |
AIDS is said ______ the biggest health challenge to both men and women in that area over the past few years.
| A．that it is | B．to be | C．that it has been | D．to have been |
I don’t want _____ like I’m speaking ill of anybody, but the manager’s plan is unfair．
A to sound B to be sounded C sounding D to have sounded
Having been ill in bed for nearly a month ,he had a hard time________ the exam.
| A．pass | B．to pass | C．passed | D．passing |
It is believed that if a book is________, it will surely________the reader.
| A．interested …interest | B．interesting …be interested |
| C．interested …be interesting | D．interesting…interest |
_____ in thought completely, he didn’t even know what was going on.
| A．Losing | B．Lost | C．Having lost | D．Having been lost |