He sent me an e-mail, _______ to get further information.

[　　]

______ such heavy pollution already, it may now be too late to clean up the river.

[　　]

Though ________ money, his parents managed to send him to university.

[　　]

_______, we must read the instructions first.

[　　]

A．When using this machine

B．When this machine using

C．When this machine used

D．When used this machine

_______ their work, the students didn't go home.

[　　]

A．Having not finished

B．Not having finished

C．Not having been finished

D．Having not been finished

______, the mountain looks like an elephant.

[　　]

A．Having seen from a distance

B．Having been seen from a distance

C．Seeing from a distance

D．Seen from a distance

The man ______ this morning was my cousin.

[　　]

I was overjoyed at the news of my hometown ________ so much progress.

[　　]

The man ______ there is our headmaster.

[　　]

The supermarket is very crowded on Sundays, with people ______.

[　　]