His parents are convinced ____ the fact the their son always focuses his mind ___ his study.
| A．of; on | B．of; at | C．by; to | D．on; at |
.The buses, most of _______ were already full, were surrounded by an angry crowd.
| A．that | B．it | C．them | D．which |
It was not such a good dinner _______ she had promised us.
| A．like | B．that | C．which | D．as |
David is such a good boy _______ all the teachers like him.
| A．that | B．who | C．as | D．whom |
David is such a good boy _______ all the teachers like.
| A．that | B．who | C．as | D．whom |
______ is mentioned above that the number of the students in senior school is increasing.
| A．Which | B．As | C．That | D．It |