Electricity is not easy _________ when an earthquake happens.

Although ________ to stop, he kept on working

_____ in 1936, Harvard is one of the most famous universities in the United States.

While cleaning the snow on the road, _________.

On the box        a beautiful card         , “Happy Birthday, Guo Hailong!”

The women         there under the tree,         in a black skirt, is our Chinese teacher.

. _____ in her best skirt, the girl tried to make herself ____ at the party.

The office ordered his soldiers ________.

Wang Ping found the new surroundings difficult ______.

        twice a year, whether it is a car ,a bus or a truck, is the rule that every driver must obey in this city.