________ the civil service has its obvious advantages，it doesn’t necessarily suit everyone.
A．While B．Because
C．Since D．When
He thought this was the first pair of shoes that had fitted him ________.
A．perfectly B．justly
C．fairly D．rightly
He didn’t ________ what I read because his mind was on something else.
A．hold on B．catch on
C．take in D．get over
Nobody but doctors or nurses and those ________ by Dr Li ________ to enter the patient’s room.
A．being invited；allowed
B．are invited；are allowed
C．invited；is allowed
D．invited；are allowed
I wish that you ________ such a bad headache because I’m sure that you would have enjoyed the concert.
A．hadn’t B．didn’t have had
C．hadn’t had D．hadn’t have
Calculations，which are astronomically exact，have been made ________ with the use of computers.
A．possible B．it possible
C．possibly D．to be possible
