单项选择题

A．It is required by Professor Stephen.
B．It is very interesting.
C．He wants to know about heart attacks.
D．He took part in the discussion.
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单项选择题
A．In the middle of the semester.B．At the beginning of the exams.C．At the end of the school year.D．In the middle of summer vacation.
A．In the middle of the semester.
B．At the beginning of the exams.
C．At the end of the school year.
D．In the middle of summer vacation.
填空题
While learning a foreign language ,. the greatest problem isn’ t vocabulary or grammar or pronunciation, but ______.
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