Điền từ còn thiếu vào chỗ trống, hoàn thành câu

1. “………!The train is around the corner!
a. Watch out   b. See out   c. Look out of   d. Look back
2. Hi, Tracy, you look tired. “…”
a. Really  b. You think so?   c. No I didn’t   d. I’m tired
3. How’s Joe after the accident?-“…”
a. Thanks   b. He seems to be ok
c. Not at all   d. You’re very nice
4. The ceiling in this room doesn’t look very safe, does it?-“……….”
a. Yes, it is   c. No, it is going to fall down
b. No, it isn’t   d. Yes, it doesn’t