He goes to work by bus. Which of the following is correct for the underlined word in the sentence?

Have you finished you homework     ? Yes, I have finished it   .

 —What’s a quarter and a half, do you know?—Yes, it’s __________.

Little Tony is a very _____girl, and she doesn’t like to talk with others.

The restaurant is so popular here. Look, there are so many _____ here.