Li Lei's parents ______ doctors.
— Lily wants to know if we ________ a picnic this weekend.— Yes. If it ________, we will stay at home to play cards instead.
My friend Amy _______ text messages to me on the mobile phone, but now she _______ e-mails on QQ.
I have so much homework to do that I don’t know ________.
I can’t ______ it in English because I can’t _____ English. Can I ______ you the story in Chinese?
---- You don't know what great difficulty I had _____ to get the two tickets.---- But the film is really worth_______ twice.