__________ hard they have tried to surpass our company in semiconductor manyfacturing technology, they have never made any progress.
A.as
B.however
C.although
D.because

The merchandise that you purchased from is still returnable ____________ you have your receipt.
A.as long as
B.together with
C.whereas
D.in case of

___________ Mr Jones ask to get the recent sales figures, please provide him with a copy of the quarterly report.
A.If
B.Should
C.When
D.After

That we will see an increase in the production capacity of our auto parts manufacturing plant __________ the next year is obvious.
A.during
B.when
C.since
D.while

Had the student spoken (A) politely (B), the teacher wouldn’t be (C) angry (D).
A.angry (D)
B.wouldn’t be (C)
C.Had the student spoken (A)
D.politely (B)

Suppose (A) you have (B) the money in your account, you can withdraw (C) up to (D) $100 a day.
A.up to (D)
B.Suppose (A)
C.have (B)
D.can withdraw (C)

Choose the best answer to complete the following sentences._________ when you place your order, we will do our best to get it filled by the time you request.
A.as though
B.even so
C.as if
D.no matter

BioTech will change its end user licensing agreement policy ________ the complaints that we have received regarding its practicality.
A.despite
B.because
C.in light of
D.although

Lear Industries has decided to hire 50 new employees ______________ they recently signed a government contract worth an estimated ten million dollars.
A.because
B.although
C.owing
D.due to

I thought I could find authenic Korean antiques in Insa-dong, yet they had nothing _____________ reproductions.
A.so
B.or
C.but
D.and