有氧运动最好采用（ ）的运动方式为佳。

(单选题)—How long have you ______ your bike?—For about two months. (单选题)London is ______ capital of ______ England. (单选题)—What do you do?—______ (单选题)Your brother is ______ to go to school. (单选题)______ a cold winter morning he left ______ Shanghai. (单选题)______ foreigners come to our country every year. (单选题)______ playground is much larger than ______. (单选题)I have ______ to tell you. (单选题)Mrs. White is ______ in the park now. (单选题)There is ______ water here, and there are quite ______ empty