— Would you like to go to the cartoon show with me?— It sounds like fun, ______I’m too busy.

My father was reading a book ________ I was doing my homework.

It’s snowing heavily outside. Put on your coat,_________ ,you’ll catch a cold.

-- I’ll give the boys _____ to eat.        

---How long have you known the doctor ?  ---_________he helped me three years ago.