题目内容

While Facebook remains the most popular social____ site, its growth has gradually slowed down.

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Order all your camping ____ online today, everything you need to make a camping trip easier and more enjoyable!

One of the first flight training lessons taught to student pilots is how to perform an ____ landing in a small airplane.

When you read the newspaper, you’re probably not reading it word-by-word, instead you’re ____ the text.

____that story book was indeed very popular, but it was not long before the demand declined.