After completing and signing it, please return the form to us in the envelope ________．

A．providing

B．provided

C．having provided

D．provide

The manager was concerned to hear that two of his trusted workers ________．

A．will leave

B．are leaving

C．have left

D．were leaving

Be ________-you can't expect me to finish all this work in so little time．

A．reasonable

B．confident

C．creative

D．grateful

A number of high buildings have arisen ________ there was nothing a year ago but ruins．

A．when

B．where

C．before

D．until

If we ________ adequate preparations, the conference wouldn't have been so successful．

A．haven't made

B．wouldn't make

C．didn't make

D．hadn't made

Being able to afford ________ drink would be ________ comfort in those tough times．

A．the; the

B．a; a

C．a; 不填

D．不填；a

After Jack had sent some e-mails, he ________ working on his project．

A．had started

B．has started

C．started

D．starts

He smiled politely ________ Mary apologized for her drunken friends．

A．as

B．if

C．unless

D．though

George returned after the war, only ________ that his wife had left him．

A．to be told

B．telling

C．being told

D．told

It doesn't matter ________ you pay by cash or credit card in this store．

A．how

B．whether

C．what

D．why