根据句子意思，用所给单词的适当形式填空。
【小题1】The height (high) of the new building is over 400 meters.
【小题2】On Christmas Eve, the Santa Claus hides gifts secretly (secret) into kids' stockings.
【小题3】— How many times should I take the pills, doctor?
— Twice (two) a day, please.
【小题4】— Shall we meet at 9:00 at the school gate tomorrow morning?
— I hope we can make it earlier (early). What about 8:30?
【小题5】Mr. Li's report gave us a deep impression (impress) .
【小题6】Remember to turn (turn) off the lights when you leave the room, please.
【小题7】The film was based (base) on Chinese history in the 1940's.
【小题8】Look! Can you see a kite flying (fly) in the sky?
【小题9】The boy is a good swimmer. He can swim across (cross) the wide river.
【小题10】Many students find it boring (bore) to play puter games all day.
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解析：
【小题1】指高度，用名词形式。
【小题2】修饰动词hides，用副词形式。
【小题3】指次数。
【小题4】时间提早了，用比较级。
【小题5】give sb sth结构，a deep修饰后面的名词。
【小题6】remember to do sth“记得做某事”。
【小题7】be based on“以……为基础；以……为依据”。
【小题8】see…doing sth“看见…正在做某事”
【小题9】此处使用介词。cross是动词；across是介词。
【小题10】“…find it +形容词+to do sth”，用做形容词，指的是做某事无聊，用boring。