I was worried about my math，but Mr．Brown gave me an A. —______________.

When he _____ the door, he found his keys were nowhere. [ ]

We work together to achieve our common purpose： ________ world that is safer, cleaner and healthier than ________ one we are living in.

In the end, she decided to sell the house ______ windows face south.[ ]

Excuse me, could you tell me ________