Which of the two English dictionaries will you buy?——I’ll buy ________ of them, so I can give one to my friend Helen.

please pass the key _______ the lock. —oh! Is it a set _______ keys?[ ]

Why don’t you _________your teacher for help?

Hui Ruoqi is a _________ volleyball player. She plays volleyball very _________.

is a good idea to bring your camera because you may want to take photos of the autumn leaves.