The old tower must be saved,________ the cost．

A．however

B．whatever

C．whichever

D．wherever

— Did Jack come back early last night?

— Yes．It was not yet eight o'clock ________ he arrived home．

A．before

B．when

C．that

D．until

________,he talks a lot about his favorite singers after class．

A．A quiet student as he may be

B．Quiet student as he may be

C．Be a quiet student as he may

D．Quiet as he may be a student

He tried his best to solve the problem,________ difficult it was．

A．however

B．no matter

C．whatever

D．although

He transplanted the little tree to the garden ________ it was the best time for it．

A．where

B．when

C．that

D．until

I'd like to arrive 20 minutes early ________ I can have time for a cup of tea．

A．as soon as

B．as a result

C．in case

D．so that

The day breaks,________ the birds are singing．

A．for

B．because

C．since

D．as

— Did you remember to give Alice the money you owed her?

— Yes,________ I aw her,I remembered it．

A．while

B．the instant

C．suddenly

D．soon

________ he does his work,I don't mind what time he arrives at the office．

A．So far as

B．So long as

C．In case

D．Meanwhile

Take an unbrella ________ it rains．

A．in any case

B．in case

C．be cause

D．for