It was hard for him to learn English in a family, in which ________ of the parents spoke the language.

The professor was ________ to give us a lecture this afternoon, but it has been cancelled because of the delayed flight.

 — It’s my treat today. Is there anything particular you would like to have?—______ you choose is fine with me.

 Many websites have been _______ to help people study foreign languages.

 Once you are ________ to smoking, it is difficult to give it up.