(17)Two_________(three) of the students in our class are good at English.
根据句意可知这里表示在我们班擅长英语的学生数量达到多少,故此空应填thirds,two thirds是分数的表示法,意为"三分之二"。表示分数时分子用基数词,分母用序数词,如果分子大于一,则分母应用复数形式。
五、当所给词为动词时,应注意动词的时态或语态的变化、动词和名词的相互转化、动词的非谓语形式(V-ing形式、动词不定式等)等。动词转化为名词的方法常见的有:
1. "动词+tion"。例如:operate→operation, invent→invention等。
2. "动词+er"。例如:work→worker, sing→singer, teach→teacher, write→writer, speak→speaker, play→player, run→runner, win→winner等。
3. "动词+or"。例如:visit→visitor等。
4. "动词+ing"。例如:build→building, turn→turning, wash→washing等。
(18)I'm sorry to keep you_________(wait).
在动词enjoy, keep, finish, mind等动词后应跟V-ing形式,故此处应填waiting。
(19)Let the twins_________(do) it.
在动词let, make, see, watch, feel, hear, have (使)等使动词后常跟不带to的动词不定式作宾语补足语,故此处应填do。
(20)Can't you hear them_________(sing) in the classroom?
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