题目

动词填空【1】There are some students __________(plant) trees in the field. Let’s help them.【2】I will invite my friends __________(watch) a film with me.【3】---Where is our principle Mr Shen?---He __________(show) the visitors from Shanghai around our school.【4】Daniel __________(work) on his project (项目) these days.【5】I hope all my classmates __________(get) high marks in the coming exam (考试).【6】It’s raining outside. Why not __________(stay) at home and do some reading?【7】It’s difficult for the old people __________(use) smart phones.【8】Look! The m2．小贺和同学周末结伴去游玩，来到大草坪中央，他们对着前方680米的大山喊：大山，你好！（空气中的声速是340m/s）（1）请计算出他们的声音从发出到反射回来的时间是多少s？（2）他们能否听到自己的回声？