The Century Handbook of Writing - Garland Greever; Easley S. Jones

Exercise:

My next experience was in a grain elevator. Where I worked for two summers.
The parts of a fountain pen are: first, the point. This is gold. Second, the body.
The form is set rigidly. So that it will not be displaced when the concrete is thrown in.
There are several reasons to account for the swarming of bees. One of these having already been mentioned.
Since June the company has increased its trade three per cent. Since August, five per cent.

2. Do not leave uncompleted a construction which you have begun.

Wrong: You remember that in his speech in which he said he would oppose the bill.
Right: You remember that in his speech he said he would oppose the bill. [Or] You remember the speech in which he said he would oppose the bill.
Wrong: He was a young man who, coming from the country, with ignorance of city ways, but with plenty of determination to succeed.
Right: He was a young man who, coming from the country, was ignorant of city ways, but had plenty of determination to succeed.
Wrong: From the window of the train I perceived one of those unsightly structures.
Right: From the window of the train I perceived one of those unsightly structures which are always to be seen near a station.

Exercise:

As far as his having been deceived, there is a difference of opinion on that matter.
The fact that he was always in trouble, his parents wondered whether he should remain in school or not.
People who go back to the scenes of their childhood everything looks strangely small.
It was the custom that whenever a political party came into office, for the incoming men to discharge all employees of the opposite party.
Although the average man, if asked whether he could shoot a rabbit, would answer in the affirmative, even though he had never hunted rabbits, would find himself badly mistaken.

3. Do not omit a word or a phrase which is necessary to an immediate understanding of a sentence.

Ambiguous: I consulted the secretary and president. [Did the speaker consult one man or two?]
Right: I consulted the secretary and the president. [Or] I consulted the man who was president and secretary.
Ambiguous: Water passes through the cement as well as the bricks.
Right: Water passes through the cement as well as through the bricks.
Wrong: I have had experience in every phase of the automobile.
Right: I have had experience in every phase of automobile driving and repairing.
Wrong: About him were men whom he could not tell whether they were friends or foes.
Right: About him were men regarding whom he could not tell whether they were friends or foes. [Or, better] About him were men who might have been either friends or foes.