I’d like a room _____ window looks out over the sea.

(2013·四川南充市一模)My favorite writer is Mo Yan, some of ________ novels have a surprising ending.

You can only be sure of_________ you have at present; you cannot be sure of something _____ you might get in the future

I don’t know if it _______ tomorrow . If it ______ ,I won’t go there.

The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?—____ my students have a try?