——I think Paul is __________ a careful person that he seldom makes mistakes.——But this time he did. He was __________ nervous that he made a tiny mistake.
The sentence structure(结构)of “Teachers ask me to finish the homework on time” is ____________.
I think ____necessary for us _____the birds.
Parents ______ good conditions(条件) _______ us. We should be grateful(感激的)to them.
I have _____ useful dictionary. Do you have ______?
About seventy percent of our earth _______ by water.