I always go skiing with my friends ______ winter.

－The dish is delicious!－Well, at least it’s as       as the one I cooked yesterday.

You have finished writing an e-mail on computer , but too many mistakes in it . You can chick _____ .

—______ a week do you walk your dog?   —Less than three times a week.

---Can you tell me something about Liu Yang?---Oh, she _____ the first Chinese woman astronaut to get into space.