.At the beginning of class, the noise of desks ____ could be heard outside the classroom.
—Dear, you water the garden and I do the cooking.
—How does the Internet ____us? —By sharing information free of charge.
The director asked me to finish this task by Sunday.How can I ____to?
The letter Mary had looked forward to ____her last night and she was very excited.
The news shocked the whole nation ____a strong earthquake hit Yushu on Apr.14, 2010.