About 71% of the earth’s surface ______ covered with water, but 20% of the world population ______ have access to safe drinking water.
When he was working there he caught a serious illness from _____ efforts he still suffers.
I’m ________Chinese and I do feel ________Chinese language is ________most beautiful language .
I wonder why he didn't do it as _____.
—What made Mary so sad? —_____ three tickets to the music concert.
—Do you think it's going to rain over the weekend? —_____ .