Here are the best answers for each of the exercises:

62) A café is a small restaurant ____ people can get a light meal.
- **D. All are correct** (A, B, and C are all valid relative pronouns)

63) My room has a very large window ____ you can see the whole lake.
- **D. All are correct** (A, B, and C are all valid relative pronouns)

64) Alaska, ____ my brother lives, is the largest state in the United States.
- **B. where** (this is the most appropriate option; "which" can also work but is less idiomatic)

65) This is the house ____ we often stay the summer.
- **A. where** (this is the best choice; "that" can also work)

66) Do you remember the clock tower ____ I first met you?
- **D. All are correct** (A, B, and C are all valid relative pronouns)

67) Tell me the reason ____ you were absent yesterday.
- **C. why** (this is the most idiomatic)

68) Do you know the reason ____ Laura doesn’t like me?
- **D. why** (this is the best choice)

69) There was a time ____ dinosaurs dominated the earth.
- **D. A & B are correct** (both "when" and "that" can work)

70) The house in ____ I was born and grew up was destroyed in an earthquake ten years ago.
- **D. All are correct** (A, B, and C are all valid relative pronouns)

71) Summer is the time of the year ____ the weather is the hottest.
- **D. B & C are correct** (both "which" and "that" are valid options)

72) The reason ____ Jim has just lost his job is that he didn’t work hard enough.
- **C. that** (this is the most idiomatic)

73) They hid the money in a place ____ it was safe from robbers.
- **D. All are correct** (A, B, and C are all valid relative pronouns)

74) Please tell me the reason for ____ I should let you go.
- **D. B & C are correct** (both "which" and "why" can work)

75) I know a wood ____ you can find wild strawberries.
- **D. All are correct** (A, B, and C are all valid relative pronouns)

76) Can you suggest a time at ____ it will be convenient to meet?
- **B. when** (this is the most appropriate option)

77) Is there any reason for ____ you should have a holiday?
- **D. A & B are correct** (both "why" and "that" can work)

78) Tell me the countries ____ the traffic moves on the left-hand side.
- **D. A & B are correct** (both "where" and "which" can work)

79) We keep our bread in the bridge ____ it doesn’t go bad.
- **B. so that** (this is the appropriate choice)

80) ____ these cars are cheap, they last a long time.
- **C. Although** (this is the most appropriate choice)

81) You should give the iron time to heat up ____ you iron your clothes.
- **D. before** (this is the most appropriate choice)