From space, the earth looks blue. This is __________ about seventy-one percent of its surface is covered by water.
He spends little time on English, but, he has passed the important examination.
—How did your mother react ________ the news? —She reacted by getting very angry.
I was ________ at the letter, which was _________ to my classmates..
—What a beautiful picture you’ve drawn! ---_.
--Mr.Smith is very strict his students,isn’t he? --Yes,he is.He is strict_work as well.