_____ I can’t fully understand what his music conveys, his performance is quite impressive．
A．As B．Since C．If D．While
His uncle went abroad in 2010, and ________since．
A．has not been heard of B．had not been heard of
C．had not heard of D．has not heard of
It is required in the library regulations that any book borrowed __________ by due time, or the borrower will be fined．
A．return B．be returned
C．returns D．is returned
I broke my relationship with John because he always found _______ with me．
A．error B．mistake C．fault D．failure
His new car, ________ he paid 7,000pounds, has already had to be repaired．
A．on which B．on that
C．for that D．for which
Your failure in the final exam is due to the fact that you didn't ______ enough importance to your English．
A．attend B．attack C．attach D．obtain
