After six-months probationary period, city employees are _______ to take vacation days.

A. where

B. which

C. whose

D. when

A. Melting glaciers and the implications for the world.

B. The global warming problem, ice in mountains in Bolivia.

C. The glaciers of the Himalayas and the Andes could disappear in this century.

D. Greenland’s melting continues by the year 2100.

A. The need for vertical farming in urban centers to meet the growing food demand.

B. Vertical farms would need to be efficient, cheap.

A. He could have set up his own business with his father’s money.

B. If he could have set up his own business, his father would give him money.