—Boys and girls, please have a seat and ____.—Thank you.
After a serious illness, he finally _______ how important his health is.
It is our ________ to look after our parents when they get old.
Our teacher is very kind to us. So we regard her ________our best friend.
He was ill , _______he still went to school on time.
Kitty and Simon will arrive ___________Shanghai with their parents this week .