________ many changes have _______, we should keep pace with the changes too.
They say that_______a lot of water is good for you.
It was _______ a dangerous drug ______ he nearly died.
Students should be encouraged to use _________ Internet as _________ resource.
When it comes to job interviews, first ________________ including the way you speak and dress, are extremely important.
The chairman thought necessary to invite Professor Smith to speak at the meeting.