Jenny, do you know WeChat（微信）was created by—By Zhang Xiaolong, right

－Don’t _____ too late, you will feel tired in class. －I won’t, Mum.

Jenny hopes that Mr Smith will suggest a good way to have her written English ________ in a short period [ ]

Do you know how to prevent the A/H1N1flu—- You can ask the doctor for some________.

Where have you been， Ann You ______ on the phone just now.