一Let’s try operating the machine right now．一Wait．Better read the ______ first．

Tom’s __towards guests really makes me feel embarrassed in the party. 

The drilling in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental ______ and severe cold.

We could see nothing in the thick fog at a _____ of two meters, so we got lost.

Patience is an important ____ of a happy and rewarding life. After all, some things are worth waiting for.