John Key and his colleagues do have a heavy burden to carry.

He plods on under his heavy burden of duty and water bottles.

It employs too many people, placing a heavy burden on the economy.

Totally exhausted, the two men dropped their heavy burden on the earth.

Whensoever I made the discovery, it laid a heavy burden on me.

The recent war imposed an unusually heavy burden of taxation upon us.

The heavy burden hanging down so uncomfortably from one shoulder looked bad.

Unused to the heavy burden laid on me, I went rather slowly.

And by doing so he has imposed a heavy burden upon us.

She was like one whose back is relieved of a heavy burden.

Never before had Life itself pressed upon him with its heavy burden.

Those are the footprints of a man, laden with a heavy burden.

At length, fatigued with carrying our heavy burden, we stopped to rest.

For us Life is something merely tiresome, dull,- akindof heavy burden.

They were pressed into labour, were saddled with the labourer's heavy burden.

Yet how could she climb and carry that heavy burden with her?