---Do you know when he will come back tomorrow? ---Sorry, I don’t know. When he back, I’ll tell you.
My sister is only four years old, but she can look after ________ now.
This term, we have ________ new subject—physics. It’s interesting.
— Mr. Brown, please teach me how to draw on the computer today. — Oh, no hurry. _________. You have to get familiar with the keyboard first.
— Could I use your bike for today, Sam? — _________. I’m not using it.
— Who’s that man over there standing in the garden? Is it Mr. White? —It __________ be him. He has gone to Shanghai on business.