Many boys enjoy _______ football, basketball or baseball

－ What does the sign over there read － “No person ________ smoke or carry a lighted cigarette, cigar or pipe in this area”

Which do you think is ________, health or wealth？

We need friends to ________, or we will feel lonely（单选）—4分

8051单片机的两种低功耗模式是 ______和 _______ 。

经纬仪在检、校中，视准轴应垂直与横轴的检验有两种方法。它们分别为_____和______。

临床上常用的平衡盐溶液有两种，其配方分别为____和____。

29．__________ when you are on the bus or bike．

Which do you think is _________________important, health or wealth?

目前应用较多的两种铜电阻其分度号分别为______、______。

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

液体运动的两种型态为___,___。