You must have missed the first train yesterday, ________ you?

—Oh, it's so cold. We haven't had such a severe winter for so long, _______ we？—Yes, the forecast says it's going to get worse _______ it warms up.

—Lucy,        do you go to the park?—Three times a week.

一Do you have _______pens in the pencil case?一No，I don’t have _______ ．

— ____ is your mother?— She is in the kitchen.