Listen! Is Mary singing in the next room?—No. It _______ be Mary．She has gone to Shanghai for an important meeting.

Have you seen the film Titanic? —No , but I ________.

I’m glad to see that the government has_______ the open space _____a public library. —Me, too. We can do some reading there.

If a=”4,” b=”5,” what’s the answer to the question “ a + 2ab +1 =?”—.

Maria is wanted on the telephone. Where is she?—She _________ the library. You can find her there.