The question______new measures should be taken to control the terrible air pollution is______puzzles scientists a lot.
Why does she steal things _she could easily afford to buy them?
More than 100 students have entered for the competition andgains the most points will be the winner
After that he knew he could_any emergency by doing what he could to the best of his ability.
—You may find the key to the math problem on page 107. —Ah, it's so simple. I wonder why I _of that.
A turning point of the continuously high housing price won't appear suddenly because there must be a certain process _many factors lead to the change.