1.I would appreciate your keeping it a secret.
2.Mark often attempts to escape being fined whenever he breaks traffic regulations.
3.No matter how frequently performed, the works of Beethoven always attract large audiences.
4.It is recommended that the project not be started until all the preparations have been made.
5.I wish I could have slept longer this morning, but I had to get up and come to class.
6.We didn't know his telephone number, otherwise we would have telephoned him.
7.Turn on the television or open a magazine and you will often see advertisements showing happy, balanced families.
8.While people may refer to television for up-to-minute news, it is unlikely that television will replace the newspaper completely.
9.An Olympic Marathon is 26 miles and 385 yards, the distance approximately from Marathon to Athen.
10.You will want two trees about ten feet apart, from which to suspend your tent.
11.As I was just getting familiar with this job, I had much to ask my boss.
12.Until quite recently, most mothers in Britain did not take paid work outside the home.
13.The survival of civilization as we know it is under threat.
14.Scientists say it may be five or ten years before it is possible to test this medicine on human patients.
15.In some countries, what is called "equality" does not really mean equal rights for all people.
16.I walked too much yesterday and my leg muscles are still aching now.
17.Radio, television and press are the three most common means of conveying news and information.
18.Liquids are like solids in that they have a definite volume.
19.When a fire broke out at the National Exhibition in London, at least ten priceless paintings were completely destroyed.
20.The destruction of these treasures was a loss for mankind that no amount of money could make up for.
21.Then the speaker went into the various factors leading to the present economic crisis.
22.The students was just about to give up the questions, when suddenly he found the answer.
23.When there are small children around, it is necessary to put bottles of pills out of reach.
24.The sight of blood always makes him feel sick.
25.In Britain, the best season of the year is probably late spring.
26.Free medical treatment in this country covers sickness of mind as well as ordinary sickness.
27.This hotel charges $ 60 for a single room with bath.
28.Although he had looked through all the reference material on the subject, he still found it hard to understand this point and her explanation only added to his confusion.
29.A completely new situation will arise when the examination system comes into existence.
30.It took him several months to breed the wild horse.
请不要用软件翻译，保证句子通顺合理~
有点多，但如果好的话，会再加分。
多谢了。