The plane of the Polish president was about to land ______ it snagged(挂) treetops and crashed, ______ the president and 96 others on board.
| A．while, killed | B．when, killing |
| C．and, and killed | D．when, to kill |
Maria's been my partner since I the business from my father．
| A．handed over | B．got across | C．came across | D．took over |
It was such a difficult problem_______ few students in our class worked out．
| A．that | B．what | C．as | D．which |
—What do you mean by saying money makes money?
—______, the more you invest, the greater your potential profit will be．
| A．To be honest | B．To begin with |
| C．To tell you the truth | D．To put it another way |
The first time I saw her, Mary was standing still in the wind, her long hair _____in the air.
| A．is flying | B．flying | C．to fly | D．flew |
Sometimes he found _______very hard to fall asleep at night, so he went to see the doctor．
| A．him | B．this | C．that | D．it |