Did you see Mary and her sister this morning?– Yes, I saw _________ girls playing in the playground.

I’m going to buy a car. Any advice, Charlie?—Well, it depends on(根据) ________. If money isn’t a problem, you can buy a BMW.

Sorry, I can’t find the key ______ the lock. How can we open the door?[ ]

It is not expected ____ he said caused so much discussion at the meeting.

I would appreciate ______, to be frank, if the goods could be delivered as soon as possible．