77. Oh, sorry. A lighted cigarette burned a hole _____ my coat, and I have to change another one.
| A．in | B．on | C．at | D．By |
The policy will _______a chain reaction of automatic spending cuts that can lead to thousands of job losses.
| A．set down | B．set off | C．set out | D．set about |
Landing safely in bad weather is a _______ task for any pilot, and even the smallest error can lead to a disaster.
| A．tricky | B．secure | C．significant | D．easy |
The discovery of the oil field, to the delight of the whole nation, will largely _______ the country’s dependence on imports of energy.
| A．adjust | B．affect | C．settle | D．ease |
One hundred percent _______ to your studies, though it can be lonely and no fun at all, will leave precious marks on your youth.
| A．commitment | B．attention | C．reference | D．reaction |
The speech from the new government is a _______ that major changes are on the way.
| A．warning | B．symbol | C．goal | D．signal |