41-It isn't difficult to boil an egg
42-The pyramids were built by the ancient Egyptians
43-London isn't so hot as Cairo
44-I have not been in Hanoi for two years
45-If she didn't eat too much meat,she wouldn't be overweight
46-My father told me he had visited that beauty spot many times
47-It is said that he is a famous singer
48-The thief runs faster than the police man
49-This is the first time I have seen this man here
50-We are interested in novel