—How long do you suppose it is he arrived here?—No more than half a week.
When _____ the letter, tears came to her eyes.
Did he find _____ hard to learn a foreign language?
The computer system _____suddenly while Paul was searching for information on the Internet.
___ Mr. Smith is waiting to see you. He appears to be quite____ important person.
I will go to Beijing on business tomorrow, do you have anything ____ to your son studying in Peking University?