52. Because she passed the exam, she felt very satisfied.

53. I suggested energy-saving bulbs should be bought.

54. I suggested a charity event should be organized to raise money.

55.

- I suggested we use helmets to protect our heads.

- I suggested that helmets should be used to protect our heads.

56. I suggested organizing a cultural festival to celebrate Lunar New Year.

57.

- I suggested collecting unused clothes for the victims.

- I suggested that unused clothes should be collected for the victims.

58. The local authorities suggested the garbage should be taken to recycling centers.

59.

- They suggested that I should put an advertisement in this local newspaper.

- They suggested that an advertisement should be put in this local newspaper.

60. 

- l suggested we collect these waste things for recycling.

- I suggested that these waste things should be collected for recycling.