22.If we know more about _______causes the problem, we may take measures before it is _______late.
—Have you figured out how much the tuition is in American universities?—$19 000 or ________ like that.
________ in my life impressed me so deeply as my first visit to Qinghai Lake.
For quite ________ students, their teacher's advice is more important than ________ of their parents.
That region has a lot of natural resources while this one has ________.
—Wow! It's a fantastic decoration! Is it expensive?—No. It cost next to ________.