A company ______profits from home markets are declining may seek opportunities abroad.

Thousands of foreigners were ________ to the Shanghai World Expo the day it opened.[ ]

Ben was helping his mother when the rain began to beat heavily ________ the windows.

It was not until I had read your e-mail _____ I understood what you had done for the students.

Good to see you again. It’s almost threeyears _______ we met last time.—Yes, how time flies.