Every student as well as all the teachers ____ required to be at the bus station at 6:30 tomorrow.
| A．are | B．is | C．were | D．was |
The old couple decided to ____ a boy and a girl though they had three children of their own.
| A．adapt | B．bring | C．receive | D．adopt |
My pain _____ obvious the moment I entered the office，for the first man I met asked pitifully，“Are you feeling all right？”
| A．could be | B．could have been | C．must be | D．must have been |
You should have put the milk in the ice box. I expect it ___undrinkable by now.
| A．became | B．had become | C．has become | D．becomes |
Great as Newton was, many of his ideas_____today and are being modified by the work of scientists of our time.
| A．are to challenge | B．have challenged |
| C．are challenging | D．have been challenged |
— Can you give me the right answer?
—Sorry, I ______ . Would you repeat that question?
| A．hadn't listened | B．haven't listened | C．don't listen | D．wasn't listening |