11) It is certain that with determination and hard work you will succeed eventually.
12) It was quite apparent that both sides were making a great effort to win the prize.
13) It was almost impossible for an Indian to gain even a fair education an extremely difficult, as a result, for an Indian to rese high in life.
14) It is easy to fall into bad habits but very difficult to break away form them.
15) It’s not easy to size up (估計(jì)) the situation right now. For we are not well informed on recent developments.
16) It is not easy to say exactly what each part of the brain does.
17) It is not wise to change you money into U . S. currency.
18) It was not until about 1600B.C. when the chariot (馬拉戰(zhàn)車(chē)) was invented that the maximum speed was raised to roughly twenty miles per hour.
19) It is only recently that science has begun to give us some idea of how the brain really works.
20) It was not until the century that man realized that the whole of the