Young people from________backgrounds and different countries can form friendships that will last their entire lives.
Subject directories are built by humans.Someone has________pages and links and selected all those that are in the directory.
Some people claim that surfing the Internet is a waste of time.They make the________that children spend too much time chatting and playing games instead of focusing on their school work.
Not only has aspirin proved________for reducing fever and helping stop pain,but there are also other things that aspirin can help with.
Fleming immediately realized that the mould might have an________in treating illnesses caused by bacteria.
Nearly 3,500 years ago,people chewed on leaves or drank a kind of tea made from leaves_______a special chemical to reduce body pains and fever.
