About 71% of the earth’s surface ______ covered with water, but 20% of the world population ______ have access to safe drinking water.
______ good, this kind of fruit ______ very well in our city.
.---Hurry ! It,s high time that we____to school. ---- Oh, if only the alarm clock____earlier.
American- Indians____ about five percent of the USA population .
.They will start their project ____at helping the poor children to be educated in China's west.
It can not be a(n) ___that four jewellery stores were robbed in one night.