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Difficulties are nothing _____we are not afraid of them.

If we ______ take environmental problems seriously, the earth _______ worse and worse.

Talk to your teacher and you will get help ________ you have a problem.

—Excuse me, could you please tell me if the sports meeting ________ on time?
—Hard to say. If it ________ tomorrow, we’ll have to put it off.

-When will you go back to your hometown? - _______.

—Do you think if Tom          the work well?
—I think he will if he          his best.

—Excuse me, Mum. When can we have dinner?
—Not until it   in half an hour.

If our government ______ attention to controlling food safety now, our health ______ in danger.

— Do you think when they           to play basketball with us?
— I think they’ll come when they           free．

If you are weak ____ a subject, ______your teacher for advice can help.