One of the most important things in education is to let students ____ positive emotions and experience in the process of their learning.
With summer coming on, the weather gets hot _________.
In Switzerland, six miles west of Geneva,___________ a collection of laboratory buildings.
America was____________ was first called" India" by Columbus
To everybody's surprise, the fashionable young lady ___________ to be a thief. A.found out B.proved out C, put out D.turned out
Collecting stamps as a hobby___________ increasingly popular during the past fifty years.