根据情景，选择正确选项。 1. — _____ — No, my bag is blue. [     ] A. What colour is your bag? B. Is your bag black? C. Whose bag is this? 2. — _____, where is the park? — _____ I don't know (知道). [     ] A. Excuse me; Excuse me B. Excuse me; Sorry C. Sorry; Excuse me 3. — _____ boys are there in the class? —  There are eight. [     ] A. How many B. How much C. How some 4. — Your dress is very nice. — _____ [     ] A. Thanks. B. Right. C. No.