. ________ he realized it was too late to return home.
| A．Not until dark | B．It was until dark |
| C．It was not until dark that | D．It was dark that |
Along with the letter was his promise ________he would visit me this coming Christmas.
| A．which |
| B．that |
| C．what |
| D．whether |
I was just talking to Margaret when Jackson________.
| A．cut in |
| B．cut down |
| C．cut out |
| D．cut up |
Now many crops can be improved ________different species of plant, such as rice, wheat.
| A．by making |
| B．by crossing |
| C．by converting |
| D．by changing |
________of food ________to the countries struck by the seaquake(海啸)．
| A．Large quantities; is sent |
| B．Large quantities; are sent |
| C．Large numbers; is sent |
| D．Large numbers; are sent |
Each player of chess is trying to trap the other player's king into a position ________escape is impossible.
| A．when |
| B．that |
| C．in which |
| D．from which |