31. All books ______ to the library more than three days late will be subject to a fine.
| A．return | B．returning | C．to return | D．Returned |
— Don’t worry, Mum. The doctor said it was only the flu.
—____! I’ll tell Dad there’s nothing serious.
| A．What a relief | B．Congratulations |
| C．How surprising | D．I’m so sorry |
All flights ____ because of the snowstorm, many passengers could do nothing but take the train.
| A．had been canceled | B．have been canceled |
| C．having been canceled | D．being canceled |
As he works in a remote area, he visits his parents only ____.
| A．occasionally | B．anxiously |
| C．practically | D．urgently |
It was the training ____ he had as a young man ____ made him such a good engineer.
| A．what; that | B．which; that |
| C．that; which | D．that; what |
Nobody but doctors or nurses and those____ by Dr.Hu ____ to enter the patient’s room.
| A．invited; is allowed |
| B．are invited; are allowed |
| C．being invited; allowed |
| D．invited; are allowed |