________ unemployment and crime are high，it can be assumed that the latter is due to the former.
| A．Before | B．Where | C．Unless | D．Until |
Good Heavens!How could you stand by and __________ such a thing to happen!
| A．promise | B．permit | C．allow | D．let |
Recently the newspapers have reported several __________ of the coal mines happening in different provinces in China and the government has taken effective measures to stop such things.
| A．accidents | B．events | C．happenings | D．incidents |
During the Olympic Games,journalists from all over the world came to __________ the events.
| A．watch | B．cover | C．remember | D．enjoy |
She keeps a supply of candles in the house in case of power _________.
| A．failure | B．lack | C．absence | D．drop |
—That city __________ the widespread use of motorcycles.
—So it does,as this will help reduce transport problems.
| A．allows | B．agrees | C．pleases | D．invents |