That year his total income, with his reward ________， ________ 12, 000 yuan.
A．added to; added up to B．added; added to
C．added up to; added D．adds to; adds up to
---Do you still remember when we went to Chong qing?
----I can’t remember now but_____ sometime last summer?
A．could it be B．might it be C．must it have been D．could it have been
The demand that the law on gun ownership _____ be changed ___ is very strong.
A．changes B．will be changed C．be changed D．be changing
The increase of the number of the students makes the limited computers not ________ to each student.
A．available B．helpful C．acceptable D．affordable
He had just sent an email to his pal on the Internet ________ the system broke down.
A．while B．when C．after D．since
While intelligent people can often ______ the complex, a fool is more likely to complicate the simple.
A. sacrifice B. substitute C. simplify D. survive
