基本信息
1. in big cities, cleaning workers get ______ by the hour.
a. paying b. to pay c. paid d. pay
2. the settlement is home to nearly 1,000 people, many of left their village homes for a better life in the city.
a．whom b．which c．them d．those
3. the experiment shows that proper amounts>a．being carried>．carrying>．carried>．to carry out
