How many ________ are there in the park?

—A new study proves(证明) a        walk every day is enough to keep people away from fat.

 She was surprised by her new book’s      .

–Excuse me, haven’t you learned the new          law? Everyone in a car must wear theseat belt.-- Sorry, we won’t do that again.

There are millions of websites on the Internet and there_______ a lot of useful _______on the websites.