If you don't know the word, you can _____ in the dictionary. 

— Can I go to the movie, Mum?— Certainly. But you _______ be back by ten o’clock.

—Thank you very much for giving me a hand when I was in trouble. —Don’t mention it. I only did what anyone else    in my place. 

-Hello, _______ I speak to Lily? -Hold on, please.

According to common practice, the president _________ hold office for five years.