出于新冠肺炎的影响，老师们决定工作日在线上教英语．（decide）
Because of the COVID﹣ 19， the teachers ．
Mr．Green is so serious that he always thinks before making a decision．（careful）
Helping others is helping ，so we should try our best to help those in need．（we）
Tu Youyou is one of the Nobel Prize in 2015．We're proud of her．（win）
John is not good at ，but he would like to have a try．（sing）
回想起过去的三年，我懂得了要想成功，就必须努力学习．
on the past three years， I have learned that if I want to succeed， I must study hard．