— How often do you write to your friends ?—_____ . I’m busy with my study .
— Oh, I’m hungry. Mum, can I have the hamburger on the plate? — No. It tastes ________.
She wants three ________ and some ________.
The earth(地球) is our home, and we must _____ it clean.
–What would you like to drink? --______, please.
The children are playing a game _______ "hide and seek".