Choose the alternative that correctly completes the sentences below.
1 - She ____ be married, she isn't old enough.
2 - Listen, children, you ____ finish the essay now if you don't want to.
3 - The neighbors ______ be at home, I saw the light on in their bedroom.
4 - You ___ take a taxi. There's a good bus service.
5 - Look at that sign. You _____ park here.