This river forms a natural _______ between China and Korea.
A、boundaryA
暫無解析
ThecollegestudentsinChinaare_______fromsmokingoncampusbecausethiswilldothemnogood.
As a teacher, you should not _______ the students from asking questions in class.
Sheisalready16yearsold.Butshe_______asifshewerestillalittlegirl.
Sometimes it is very difficult to _______ some of the English words. Even the native speaker can not help.
We can not trust him any more because he often________ his duty.
