The dead rate is _____ pigs and recovery usually ______ within 7-10 days. A low in; occurs B. rich in;happens C. high in; came about D. poor in;took place
6. The factory has to stop working for a day _________ the machines can be cleaned.
5. —Jack, could I use your laptop for a while? —_________. Go ahead, please.
4. How do you feel about the food here, compared to _________ in your home town?
3. The students will ________ for the Christmas vacation next week.
2. He climbed silently ________ of seizing the thief ________.