A ruler is 2 dollars and a pen is 5 dollars. How much are they? -They are

In our school library, there a number of books on science and the number of the books growing larger and larger.

Do you like the hero ______ fights for freedom all the time in the book?—Yes, of course. I think he is great.

When _ , I was crossing the street. [ ]

She _________ watching TV, but she ____________ listening o the radio.