Although recent years have seen（）reductions in noxious pollutants from individual motor vehicles, the number of such vehicles has been steadily increasing.

The number of such vehicles（）steadily increasing.A.have...

单项选择题The number of such vehicles（）steadily increasing.

The casual attitude in the US does not mean（）no hierarc...

单项选择题The casual attitude in the US does not mean（）no hierarchy in US companies.

Religion, politics or ethnic background should be touch...

单项选择题Religion, politics or ethnic background should be touched on（）.