Dr. Robert went to New York, bought some books and _____.
Dr. Robert went to New York, bought some books and \_\_\_\__.
谓语
Little Tom is an orphan(孤儿). _____, he has to make a living by himself.
Little Tom is an orphan(孤儿). \_\_\_\__, he has to make a living by himself.
He was fined by the traffic policeman for he rode his bicycle on the _____ side of the street.
He was fined by the traffic policeman for he rode his bicycle on the \_\_\_\__ side of the street.
Now the air pollution in this city _____ more and more serious with each passing day.
Now the air pollution in this city \_\_\_\__ more and more serious with each passing day.
Since the new technology was introduced last month, we _____ in speeding up production.
Since the new technology was introduced last month, we \_\_\_\__ in speeding up production.