When they knew there was a panda in the zoo, the children could _________ wait to see it.

Mr.Smith used to smoke __________ but he has given it up.

As is known to all language learners, the newly learnt words will soon be forgotten unless they are _______ used in everyday communication.

It is one thing to enjoy listening to good music, but it is _______ another to play it well yourself.

(2013·高考福建卷)Those poor and needy teenagers were excited to find a shop at the corner where they could buy ________ priced bikes.