It ______ ，for there is no one that can be relied on.
| A．let me down | B．let on |
| C．let out | D．let off |
—Hi, this way, please.
—OK. I sometimes have no sense of ________when I arrive at the crossroad.
| A．position |
| B．direction |
| C．situation |
| D．condition |
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 |