—Sorry, I have to               now. It’s time for class.
—OK. I’II call back later.

I'm pleased to hear that you've come here to _______this matter in person.

--Would you like some wine for a change?
--No, I’ll_____ beer, thanks.

—Look! He’s running so fast!
—Hard to______ his legs were once broken.

Jake’s passed his exams. We’re going out to ______.

We couldn’t understand: what could ______ his sudden change of mind?

People are concerned about the quality of the air they ______.

Strict measures have to be ______ to protect______ children from family abuses.

Now a lot of new technologies can ________ problems in industry.

People exposed to radiation are more _______ to suffer from certain forms of cancer, which can be ______ but can’t be ______at present.