—Does he know how to work out the problem ?—Yes , he has a good idea to solve it .
When people move to another country, they often try ________ the customs of their native land.
Although punctual himself, the professor was quite used ________ late for his lecture.
Apples are usually sold by ________ weight and eggs are sometimes sold by ________ dozen.
______ professional violinsit practises for several hours a day, but ______ violinist has his own way of playing the Beethoven concert.
One more month,________these baby birds will fly out of their nest.