The water of the Miyun Reservoir is regularly ______ to ensure the security of Beijing people’s drinking water.

Hard work and lack of sleep has ______ herbeauty and youth in recent years

I don’t think your team can beat theirs. —-____. But we could if Lin Tao were on the team.

1Five _______ students fromdifferent schools took part in the English contest last Saturday.

label to each of thetrees, with detailed introduction of their features, and visitors will knowmore about them and how to protect them.