Mary wants to be ________ good doctor when she grows up．（　　）

Our reading club shares ideas with each other ________ one hour every Tuesday．（　　）

A．toB．onC．atD．for

Do you like watching ping﹣pong matches？

Yes，and ________ favorite ping﹣pong player is Ma Long．（　　）

I ________ the History Museum twice．I've learned a lot there．（　　）

I's hot today．Have some ______ please．

No，thanks．I'm not thirsty at all．（　　）