The government has to close those small factories to prevent the water of the river ______.
| A．polluting | B．from polluting |
| C．being polluted | D．polluted |
Great changes _________ in my hometown in the past 20 years.
| A．took the place | B．have taken place | C．were taken place | D．took place |
His generosity _______ him the reputation of “The most generous man” in his area.
| A．made | B．earned | C．achieved | D．gave |
It has been announced that candidates _______ remain in their seats until all the papers have been collected.
| A．can | B．may | C．will | D．shall |
_______in the ocean, it becomes powerless once it is on the beach.
| A．However a whale is powerful | B．However powerful a whale is |
| C．Whatever a powerful whale is | D．Whatever powerful a whale is |
There is a 20-minute parking ________here, so we must get back to the car very quickly.
| A．freedom | B．limit | C．allowance | D．ability |