Mr. Jones, _____ life was once very hard, is now very successful in his business.

_____ more time，he’ll make a first-class tennis player sooner or later.

I recognized John （ ） he entered the room.

My university lies in the north of the city, around （ ） high mountains.

John Smith, a diligent student, never refuses to （ ） more responsibilities that are assigned to him.

The government cannot operate effectively （ ） it is free from such interference.

It is （ ） impossible to work with this noise around.

Only when （ ） in the afternoon （ ） able to leave.

You’re （ ） understand the real meaning of love.

Before using your new pressure cooker, read the following （ ） carefully.

I can’t find my keys! Can you help me （ ） them?

The defense computers calculate way to （ ） the enemy missiles.