I can’t go there with you; I have ______ to do.

He kept thinking of the question whether it was ____ for his father to change the habit of a life time in such a short time

With the loss of labor，the old farmers ________at home had to choose less labour­intensive crops.

I’m going to give a talk on the Dragon Boat Festival to the exchange students.—Great! But don’t forget to tell them ______.

such a nice place,” Mother said as she sat at the table______ for customers.