Russia will soon return 174 sq km of territory on the northeast border to China．     more than 40 years of negotiations．

The dangerous virus ____ in the next few weeks in the laboratory can cause fatal diseases.

I n the tomb, they discovered an ancient jar, _____ numbers of treasures, ____ diamonds and gold.

 Peter has treated himself to too much delicious food，     his sharp increase in weight

_______to sunlight for too much time will do harm to one’s skin.