I find ____hard to learn history well. Can you give me some advice?
---There is somebody knocking at the door. Who________ it be?---I’m not sure. It ________ be a postman.
It’s clever _____ her to work out _____ many difficult math problems.
---How delicious the coffee is! ---That’s right. It will taste ______ with milk.
--- Didn’t your brother ________ go to school by bike? --- Yes, he did. But he ________ walking to school now.
There’s no doubt _______ Emily will be the hostess (女主持) of the New Year’s party.