Vitamin E is______.A．very popular among some peopleB．effective in memory enhancementC．very

As it is a very popular play, it would be wise to ___ seats in advance.A.buyB.preserveC.bo

What makes e－mail extremely popular on campus is most likely its ______.A．chance to revive

The______regarding vitamin C is unlikely to be resolved in the near future.A．deviationB．co

______ is common knowledge, she is very popular among her students.A．WhichB．ItC．AsD．What

Romance was a type of literature that was very popular in the______.A.Renaissance periodB.

“Publish or ________” is a very popular phrase among university teachers.