There is a great danger if the driver has been drinking alcohol or taking drugs, or _____ by speeding or breaking down traffic laws.

Effective measures should be taken to ______ the rare species _______ being over-killed by human beings.

After decades of effort, the city is still trying to _____ how to stop smoking in public places. 

His mother ____________ an acute disease and passed away three months later. 

I would like a job which pays more, but ______ I enjoy the work I’m doing at the moment.