.China is one of the largest countries in the world, _______ 9.6 million square (平方) kilometers.
___sign the contract unless you are sure you understand it.
Eyewitness provides an evidence that he was ___ of the crime.
Wash your hands with soap and water ___ after each contact with the sick person.
After the fun he has had during the holidays, the boy can’t ___ on his schoolwork.
Jim went to answer the phone. ___, Harry started to prepare lunch.