题目

钟摆每来回摆动一次的时间是相等的。 答案：正确用所给单词的适当形式填空【1】It’s not easy________ (cross) the river.【2】Bob always ________ (leave) school at 4:20 p.m.【3】Here, all the________ (villager) can speak English.【4】We can see some old ________ (boat) in this picture.【5】________ ( Ben) apples are not big but red.