You can come here to ask me ________ if you have any questions.
The news shocked the whole nation ____a strong earthquake hit Yushu on Apr.14, 2010.
You ____be tired—you have worked only for ten minutes.
—Tom lost his job last week. —___he is wandering in the street these days.
The largest collection, ______in England, was one of about 200,000 silver pennies.
She did not take the advice that she ___ at rush hour, so she got lost.