一、根据句意，用括号中所给词的适当形式填空。
1. Paper money was a great (invent) in history.
2. Without taking so much cash, they can travel (easy) and safely.
3. Jim is lazy, so he makes (little) money than his hard - working brother, Tim.
4. As we know, there are different (number) on each piece of paper money.
5. It is snowing, and there is a thin (cover) of snow on the ground.

一、1. invention 2. easily 3. less
4. numbers 5. covering

【解析】
1. 空格前有形容词great，需用名词作表语，invent的名词形式是invention，故填invention。
2. 此处需要副词修饰动词travel，easy的副词形式是easily，故填easily。
3. 由句中than可知要用形容词比较级，little的比较级是less，故填less。
4. different后接可数名词复数，number的复数形式是numbers，故填numbers。
5. 空格前有形容词thin，需用名词，covering表示“覆盖层”符合语境，故填covering。
【答案】
1. invention 2. easily 3. less
4. numbers 5. covering
【知识点】
词性转换、形容词比较级、可数名词复数
【点评】
本题考查基础语法知识，需结合语境和语法规则判断单词的适当形式，侧重对学生基础语法运用能力的考查。
【难度系数】
0.8