腭扁桃体是人体的免疫器官之一，下列正确的是（）

A.扁桃体由淋巴组织组成，内含结缔组织网、淋巴滤泡间组织

B.扁桃体生发中心功能最活跃期为3～5岁，此时扁桃体显著增大

C.青春期后扁桃体免疫活动趋于减退，组织本身逐渐缩小

D.扁桃体增大是免疫活跃的标志，不应行手术切除

E.扁桃体隐窝的出现降低了人体免疫能力

根据中文提示写出单词，完成句子，每空一词。

小题1:__________, (不幸的是)we didn’t catch the school bus and had to walk to school.

小题2:Whatever your _________(选择) is, I will just follow you.

小题3:The books should be returned no _________ (迟) than next Friday.

小题4:He’d like to buy a present for his grandpa’s ___________(99) birthday.

小题5:Please be careful with these _________ (小刀). They are very sharp.