1.  Because the new while board is in great use for the teacher .

2.  Being a member of mankind, we should not hesitate for a moment to do our best to make great use of fresh water.

3.  Computer is of great use.

4.  So, computers are of great use, they have made so much work easy, people May be surprised at the strength of science and skills.

5.  In these fields people can control the robort to finish the heavy and dangerous work instead of themselves urring those processes, computer make a great use.

6.  This course runs for two years, covering eight huge textbooks, and it is both of great use and great fun.