The best way to explore _______ countryside is on _______foot.
---I bet you will go on a trip after graduation. ---______. I can’t wait!
Cole Bettles ______ by a number of universities when he received an e-mail from the University of California last month.
English is a course for anyone in university, ______ his or her major or previous educational qualifications are.
Rare species in the world, ______ by hundreds every year, must be jointly preserved by all countries, or humans will encounter ecological disaster in the near future.
The joy of life is a deep spring. Only when digging deep ______ clear and sweet water.