11. I didn't even finish half the questions.
12. Electric lights are economical, clean, and give more light than gas.
13. You should buy your suit now, both for the sake of economy and style.
14. If in doubt as to the best word, a book of synonyms should be consulted.
15. The comma fault is where, two principal clauses are run together without a coördinate conjunction.
Rewrite the following so that it will be correct, concise, and clear:
The Europeans were anxious for trade with the East, for they were dependent upon them for spices and luxuries. The three routes were through the Mediterranean Sea, over the Suez Peninsula, down the Red Sea, and across to India. Another was through the Mediterranean and then through Arabia. The other was from the Mediterranean and then through the Black Sea and then by land to India. It became necessary to seek a new route because the Turks held Constantinople, and all vessels had to pass through the Mediterranean, and the Turks held this by pirates. The first explorers were working under the leadership of the King of Portugal, and they solved the problem by going around Africa and then to the Indies, but this was too long, and so explorers tried other ways, and the result was the discovery of America.