--What's wrong with your uncle?--- We're sure____ something is wrong with him, but we doubt_____ the disease can kill him.
Do you have __________ to do?
--Tom has been to Beijing before. --________________.
Song Zuying’s ________ is sweet.
--____ do you send e-mails to your friends? -- Twice a week.
It takes me about two hours _________ my homework every day .