_______Sahara is __________ biggest desert in __________ Africa .





A._/ the / _
B.The / _ / _
C._ / the / an
D.The / the / _

They searched _________________for the missing documents but they were never found.




A.to and from
B.high and low
C.up and down
D.back to back

Many things will __________by computerized control.




A.doing
B.do
C.be done
D.did

A.killed
B.enjoyed
C.digested
D.described

After Osama bin Laden’s death, the European countries are afraid _______ the bomb revenge.




A.of
B.with
C.for
D.in

_______ the salary meets my expectations, I will accept the job offer.




A.Therefore
B.So
C.If
D.Although

A.competition
B.collection
C.common
D.conical

A.simplify
B.occupy
C.difficulty
D.supply

The floor in the room was so dirty as if it ______for months.





A.hadn't swept
B.wouldn't have swept
C.haven't been swept
D.hadn't been swept

If you ______down for a few moment, I'll tell the manager you're here.




A.should sit
B.sit
C.are going to sit
D.are sitting