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.

在关系模式R(A，B，C，D)中，存在函数依赖关系A→B，A→C，A→D，(B，C)→A)，则候选码为 [2] ，关系模式R(A，B，C，D)最高可以达到 [3] 范式。