-Hey, Jack! I’ve worked on this math problem half an hour ,but it’s got me nowhere. Could you give me a hand ?- ______ . I’m good at math.
Peter has taught ______ English for two years.
It’s a fine day, ______ it?
Dick got up into a tree ______ he saw the bear.
— His father didn’t go to work today, did he? — ______.
— How long have you studied English? — ______.