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Even if they are on sale, these air-conditioners are equal in price to , if not more expensive than , ______ , at the other store.

After a talk with his mother, the little boy has seen to _____ that the same mistake doesn’t happen again.

Berners-Lee made       possible for everyone to use the Internet, not just universities and the army.

It’s an either-or situation—we can buy a new car this year or we can go on holiday but we can’t do       .

At your company there are a few machines similar to      described in this magazine.

______ can do a job patiently and attentively for many years unless he loves it.

Environment protection requires our joint effort. ______ will be achieved unless we work well together.

We all consider _____ significant that we should cancel the order immediately.

I visite Zhangjiajie during the summer vacation .It’s a pleasant trip, ____I’ll never forget.