单项选择题
The development of the light bulb __ partly as a result of the widespread availability of electricity and the need for cheap, cicada light.
单项选择题 ______their luggage, the tourists hurried to the airport.
单项选择题 Usually there is ______ traffic in the streets on weekdays than on Sundays.
单项选择题 Don't let that old rascal take you ______ with his clever talk—none of it is true.
