It is easy for the students toschool because of the new subway in the city.

Nowadays，scientists are working hard to find a best way of treating addictions ________ drugs

Smart phones ______ in the classroom.

In 1800s, a group of adventurers(探险家) ______ on their exploring trip. Five days later, they came to what is now known as Quebec.

What do you think of your neighbor—He’s so_________ that he likes to meet and talk tonew people.