He turned down the request of his friend because it wasthe limit of his power

Television has many advantages．It keeps us ____ of the latest news and also provides entertainment in the house．_______ it’s so popular worldwide.

Have you been to Suning Plaza(苏宁购物中心) in our city–No. Although it for more than a week, I’m far too busy to go there.

Newly-developed materials for spaceships can _______ extreme weather conditions.

It is_______that______ the students in my class is 60 and ______ students like sports.