The boys followed the marks that they ________, until finally they found their way back to the campsite.
| A．left | B．have left | C．had left | D．have been left |
She knows that as a secretary she must be pleasant and helpful no matter how busy she is or what kind of ____ she may be in.
| A．mood | B．mind | C．form | D．thought |
He didn’t _____ to the news.
| A．answer | B．reply | C．react | D．hear |
________is reported in the newspapers, talks between the two countries are making progress．
| A．It | B．As | C．Which | D．What |
To keep the town clean, the truck ____ garbage is prevented ____ entering the town.
| A．loaded with; / | B．loading with; from | C．loaded of; from | D．loading of; / |
Is this the reason ____ at the meeting for his carelessness in his work ?
A. he explainedB. what he explained
C how he explainedD. why he explained