用方框中所给单词的适当形式填空，每词仅用一次（每空一词）。

小题1:My classmates and I like to go hiking in our ________ time.

小题2:Aunt Li never________ money on things that she doesn’t need.

小题3:Scientists report that it’s better to smell________ than to drink it.

小题4:It is known that Mother’s Day is the ________Sunday of May.

小题5:Turn left and you will see the library________ the bank and the supermarket.

用“＞”、“＜”或“＝”填空

（1）相同条件下的密度：氧气       空气

（2）制取氧气的速率：加热氯酸钾       加热混有二氧化锰的氯酸钾

（3）用量筒量取液体体积时仰视读数为15ml，所量液体实际体积       15ml

（4）缓慢氧化的放热量         燃烧的放热量

（5）氮气的含量：呼出气体       空气