It is hard for me to imagine what I would be doing today if I ________ in love, at the age of seven, with the Melinda Cox Library in my hometown. 

—How’s your tour around the North Lake? Is it beautiful?—It          be, but it is now heavily polluted.

He suggests we ____ to the cinema at once, otherwise we ____ late. 

I can hear the Browns' phone bell ringing but no one is answering it; they _______ be at home.

Eye doctors recommend that a child’s first eye exam____ at the age of six months old.