Huge quantities of information ________available on the internet, but whether the information ________ reliable needs to be further proved.

A great number of people were killed in the big fire, and the number of the people who _____ missing _______still increasing.

There are millions of websites on the Internet and there _______ a lot of useful _________on the websites.

The police________ already_______ his house but haven’t found any evidence against him.

_____ has been introduced to the students to help them make progress.