He is____ friend of____ writer’s. A./:the B.a;the C.a;a D a;/
They are determined to go into the dark cave, ______ my warning of danger.
一"Peter, have you got your new flat furnished?—Yes. I ______ some used furniture and it was a real bargain.
These diagrams are especially helpful when we have a concrete problem ______ at hand.
This kind of gel pen which ______ smoothly is quite popular with students.
It is the bus driver who should ______ the safety of the passengers.