–Has your father returned from Africa yet? –Yes, but he _____here for only three days before his company sent him to Australia.
He ________ in a foreign trade company for five years, but he now is a volunteer teacher in a village.
The price of food is _________ this year than that of last year.
Will future scientific discoveries ______ for us to live a much longer life?
In the meeting, the professor expressed his thanks for the aid he _________ from his students.
______ in her most beautiful skirt, the girl tried to make herselfat the party.