A driver should __ the road when .A concentrate on; drive B. concentrate in; driving C. concentrate to; drove D. concentrate on; driving
Some scientists believe that is no doubt a cure for AIDS will be found.
About four meters long, the room a small reception hall.
–Alice, feed the bird today, _____?--But I fed it yesterday.
The government has promised to the matter and give the workers a satisfactory answer.
It me that he always finishes his work in a short time. He is well-known for his working at an speed.