With his attention ________on the job,he didn't even look up when we came in.
The reason for his success is ______ he worked very hard.
______ anyone should want to kill her was unbelievable.
The government has to close those small factories to prevent the water of the river ______.
He wants to see changes in the company and I am sure he will, ______.
We should try our best to ______ those people after the disaster.