Solution:
By the end of this century, scientists surely will have discovered a cure for cancer.

Solution:
Despite his old age, his movements were as spirited as those of a young man.

Solution:
Don't be disturbed, get on with your work.

Solution:
My friend and myself study together during holidays.

Solution:
The quality of food served in this hotel is so poor that no respectable person will be wanting to eat over here.

Solution:
The custom which originated many centuries ago is slowly disappearing.

Solution:
The greatest thing in style is to have a command of metaphor.