______ of the earth’s surface ______ covered with water. A Two-third; is B Two-third; are C Two-thirds; is D Two-thirds; are
Nowadays, there is a ______ increase in children’s creativity, for they are greatly encouraged to develop their talents.
His teacher is the only one ______ he can turn when he is in trouble.
_____ of their bad habits, the boys switched from being dependent on their parents to _____ for others.
Happy birthday, Alice! So you have _____ twenty-one already.
The computer was used in teaching. As a result, not only _____, but students became more interested in the lessons.