______ in the sandstorm, he didn’t know which way to take.

We must avoid _____ a bad impression on others in public places     .

The ______ boy was last seen ____ near the East Lake.     

I regret _____ that I am unable to help you.             

we were ______ at the news of her sudden death.              

How can the students carry on with the listening test with all that loud noise _________?

Tony, would you go and see if Sam has any difficulty __________ his tape recorder?

When I came back from shopping, I found my purse __________.

Gunpowder is generally believed __________ in ancient China.

I can’t do my lessons with so much noise going on, Tom. I’d appreciate ______ the radio down.