Isn’t that your teacher over there?—No, it ______ be him. I’m sure he doesn’t wear glasses.[ ]

up late and hurried to his office, _____thebreakfast untouched.

The world top player South Korean Lee lost the game against the computer program Alphago.—_________surprising news!

_________, where’s my pen — __________, I don’t know.

One day we will manage to _____the world ______this terrible disease.