－It was careless of you to have left the door open．

－Oh, dear!________．

A．so did I

B．so I did

C．so were you

D．so did you

The humans are destroying nature day by day, ________of course, will cause severe punishment from it sooner or later．

A．who

B．when

C．on which

D．which

________ is announced in today’s paper, they have succeeded in solving many problem in accordance with the new theory．

A．It

B．That

C．What

D．As

To his disappointment, the opinion he had stuck ________ out wrong．

A．to turn

B．to turning

C．to turned

D．to be turned

－________, Can I turn on the TV?

－Yes, of course．

A．Take your time

B．Take it easy

C．Feel yourself at home

D．Make yourself at home．

In face of ________ failure, it is the most important to keep up ________ good state of mind．

A．\, a

B．a,\

C．the,\

D．\, the

－Do you mind my smoking here?

－________．

A．No, thanks．

B．No．Good idea．

C．Yes．Better not．

D．Yes, please．

It ________ we had stayed together for a couple of weeks ________ I found we had a lot in common．

A．was until; when

B．was until; that

C．wasn’t until; when

D．wasn’t until; that

It doesn’t often rain here．________, we often water the fields．

A．Instead of

B．As a result

C．More of less

D．For example

The book was written in 1946, ________ the education system has saw great changes．

A．when

B．during which

C．since then

D．since which