(A) 根据句意，在答题卡标有题号的横线上，写出括号内所给单词的适当形式。

小题1:It was raining ____________ (heavy) at this time yesterday.

小题2:They looked at our pictures, but they didn’t show us ___________ (they).

小题3:_________ (silent) in the classroom makes everyone nervous.

小题4:My grandfather is in his _________ (sixty), but he is very crazy about pop music.

______是指用户的应用程序与数据库的逻辑结构是相互独立的，也就是说，数据的逻辑结构改变了，用户程序也可以不变。