30. It is illegal to use someone's image in commercial advertisements without permission.
31. Mary ceremonies were held to celebrate the 60th anniversary of the end of the Second World War.
32. In our daily life, we mustn't make friends with those who often fail to keep their promises.
33. The teacher encouraged us to find out as many ways as possible to work out this maths problem.
34. If you have an intention to study abroad, you should make preparations as early as you can.
35. It is difficult for a spoiled child to get along with the other children.
36. Everybody should be aware that you are losing something while you get something.
37. Twenty years ago, almost nobody expected that every family in Shanghai would have a house.
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