— What do you think of modem music?— It is often considered not as good as ___________ of the past.
Clearly, in a system _________ every decision is made on the basis of tradition alone, it may be difficult to achieve progress.
Suddenly it _________ to me that I should report the accident to the police.
The following chapters provide step-by-step instructions for practical _______ of genetic (基因)engineering to agriculture.
What a moving _____to see so many people offer help to these in danger!
—Please let me know where David is. I couldn’t find him anywhere.—Well, he _____have gone far—his coat’s still here.