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？

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

现代汉民族共同语是以______为标准音，以______为基础方言，以典范的现代白话文著作为语法规范的普通话。

一个网络协议主要由以下三个要素组成：语法、语义与时序。其中语法规定了________信息的结构与格式。 Ⅰ．用户数据 Ⅱ．服务原语 Ⅲ．控制信息 Ⅳ．应用程序

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

（词汇语法）My parents are teachers. They _____（）__teach English.

（词汇语法）The reason I didn't go to Canada was __（）___ a new job.

(词汇语法)What's the weather forecast __()__ tomorrow?

网络协议的三要素是语法、语义与时序，语法是关于______。

语言的发展中，词汇的变化速度最快，____次之，而语法的演变最为缓慢。