The foreign student advisor recommended that she （） more English before enrolling at the university.

单项选择题The UN is spending 800 troops to （） the army patrolling the border area.

A．form
B．force
C．reform
D．reinforce

单项选择题It's difficult to believe that this little brown thing will eventually turn （） a beautiful butterfly.

A．out
B．around
C．to
D．into