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1·Horror films would become popular.

恐怖电影将会流行起来。

2·If they become popular, there will surely be too much air traffic.

如果它们变得受欢迎，就一定会出现过多的空中交通。

3·If the cars become popular, there is likely to beair traffic jam.

如果汽车普及了，很可能会出现交通堵塞。

4·They did not become popular until the emergence of improved batteries.

直到电池有所改善，它们才变得流行起来。

5·Nowadays, many famous campuses have become popular tourist attractions.

如今，许多著名的大学校园已经成为受欢迎的旅游景点。

6·New payment methods such as quick response codes have become popular too.

新的支付方式如快速响应码也变得流行起来。

7·Even some of these—such as pro football and TV premieres—have become popular.

甚至其中的一些——如职业足球赛和电视节目首映——也变得流行起来。

8·Today cards are often given with a present, even when people can express their wishes face to face. In recent times e-cards have also become popular.

今天，即使是能面对面表达祝福的时候，人们通常也会在礼物上附上卡片。在最近的时代，电子贺卡也变得流行。

9·Recipes have become popular with kids.

食谱很受孩子欢迎。

10·Why has this traditional clothing become popular among young Chinese people?

这种传统服饰为什么盛行于中国年轻人群体？