— How do you deal with the disagreement between the company and the customers?

— The key ________ the problem is to meet the demand ________ by the customers．

A．to solving;making

B．to solving;made

C．to solve;making

D．to solve;made

In some parts of Landon,missing a bus means ________ for another hour．

A．waiting

B．to wait

C．wait

D．to be waiting

Robert is said ________ abroad,but I don't know what country he studied in．

A．to have studied

B．to study

C．to be studying

D．to have been studying

A cook will be immediately fired if he is found ________ in the kitchen．

A．smoke

B．smoking

C．to smoke

D．smoked

An army spokesman stressed that all the soldiers had been ordered ________ clear warnings before firing any shots．

A．to issue

B．being issued

C．to have issued

D．to be issued

Helen had to shout ________ above the sound of the music．

A．make herself hear

B．to make herself hear

C．making herself

D．to make herself heard

He hurried to the station only ________ that the train had left．

A．to find

B．finding

C．found

D．to have found

When ________ help,one often says“Thank you．”“It's kind of you”．

A．offering

B．to offer

C．to be offered

D．offered

Oil prices have risen by 32 percent since the start of the year,________ a record US $ 57.65 a barrel on April 4．

A．have reached

B．reaching

C．to reach

D．to be reaching

________ in the mountain for a week,the two students were finally saved by the local police．

A．Having lost

B．Lost

C．Being lost

D．Losing