Make sure that your computer room is100%________of insects because they can really cause trouble to your machine

下列对联涉及的传统节日按一年中的时间先后排列正确的一项是①何处题诗酬锦句，有人送酒对黄花。 ②叶脱疏桐秋正半，花开丛桂树齐香。③禁火今年逢春早，飞花镇日为人忙。 ④玉宇无尘一轮月，银花有焰万点灯。

The woman burst into tears ________she was announced the winner.

Do you think an advertisement is ______ help when you look for a new job—Well, it all depends. Anyway, it gives me more of ______ chance to try.

（2014年北京市西城区高三5月二模试题）25The report aims to explain how these conclusions ______