— Stress can be extremely harmful to your health. Exercise, ______, can reduce its bad effects.— I can’t agree more.

Though having failed several times, Tim, who didn’t give up his dream, _____ made his dream come true.

Progress so far has been very good.______，we are sure that the project will be completed on time.

Luckily, the man      escape death when a fire broke out in his home on Sunday morning.

Polar bears live_______ on sea ice，which they use as a platform for hunting seals