．有一种称为“摇头丸”的毒品己从国外流入我国某些省市，我司法机关坚决予以了查缉和打击。已知这种毒品中氮元素的质量分数为10.37％，它的结构简式可能是         （   ）

根据句意和汉语提示写出单词，完成句子。

小题1:Sally gets a lot of                (礼物) for her birthday.

小题2:The scientists have designed many             （实验）to test the ability of dogs to see colour

小题3:It’s said that the young man went abroad for further education alone in his             . (四十)

小题4:           (八月)is the hottest month of a year.

小题5:Please knock at the door before ___________ (进入) the room.