—I phoned you at 9 this morning but got no answer.
—I am sorry. I _____ the bell. I _____ in the garden.
| A．didn’t have heard, must have been | B．didn’t have heard, must be |
| C．didn’t hear, must have been | D．didn’t hear, must be |
It’s not easy to learn English well. ______as much as possible is necessary.
| A．Having read | B．Read | C．Reading | D．To have read |
-----Peter, would you like a beer to go with your meal?
-----Gure, it ______.
| A．ordered | B．was oredred | C．has been ordered | D．has ordered |
Oct.1st, ______is our National Day, is always celebrated with singing and dancig.
| A．as | B．that | C．when | D．which |
Young people go to college with the expectation that______educated people get a higher pay.
| A．good | B．better | C．best | D．the best |
Only when Tom fully recovered______back to work.
| A．did he go | B．he went | C．had he gone | D．he had gone |