He left the door _____.他把门开着
open
The earth is _______.地球是圆的
round
_______ is your birthday ?你的生日是什么时候？
When
He picked up the books and put ____ on the table.他拿起书放在桌子上
them
I take my dog for a ______.我带我的狗去散步
walk
Where ______ you yesterday ?昨天你在哪里？
were
I _______ you are right.我认为你是对的
think
I knocked on the door and _____ opened it.我敲了敲门，然后打开了门
then
