Lost in the mountains for three days, what the three men were able to do was the help of helicopters.

The red army men walked from Guizhou toShanxi to avoid ___ big group of enemies.（敌人）

Tom has been fired by his boss — ? As far as I know, he is a hardworking and considerate fellow

John opened the door. There _____ he hadnever seen before.

Personal space means not only an imaginary spacearound the body, but _____ around all the senses.