―Do you know where David is? I couldn’t find him anywhere.―Well. He ______ have gone far — his coat’s still here.

 I know you have eaten all sorts of junk food your mother and I probably _____ you have.

 — Isn’t that Ann’s husband over there?  — No, it ________ be him — I’m sure he doesn’t wear glasses.

English is a language that many people around the world _______not speak perfectly but _________at least understand．

I can’t find my socks. Where ________ I have dropped them?