24. —May I go and play with Dick this afternoon, Mum?
—No, you can’t go out _______ your work is being done.
| A．before | B．until | C．as | D．the moment |
______ for half a month, the town was running out of food and clothing.
| A．Having flooded | B．As the town had flooded |
| C．Having been flooded | D．To have been flooded |
_______ for the coming examinations before, I have no time for the film.
| A．Not preparing | B．To prepare |
| C．Having not prepared | D．Not having prepared |
The books _______ belong to Mr. Smith.
| A．which is on the table | B．lying on the table |
| C．are on the table | D．which on the table |
How little Franz regretted the days ______ playing in the woods and fields.
| A．which wasted | B．wasted | C．having wasted | D．which is wasted |
They _____ be at home. You see, the door is locked from the outside.
| A．may | B．must | C．mustn’t | D．can’t |