---Does Rita feel better today?
---Her condition has______improved, but it will be some time before she returns to school．
| A．sooner or later | B．more or less | C．now and then | D．once in a while |
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 |
_____ is mentioned above, the number of the students in senior school is increasing.
| A．Which | B．As | C．That | D．It |
_______ is known to everybody that the moon travels round the earth once every month.
| A．It | B．As | C．That | D．What |