1. December when it is coldest in USA is a month(vì chỉ thời gian)

2. John will never forget the day when he met Mary for the first time (vì chỉ thời gian)

3. Danang where I was born and grew up is a city(vì chỉ nơi chốn)

4. London where we spent our vacation is a big city(vì chỉ nơi chốn)

5. The room where I am living is very nice(vì chỉ nơi chốn)

6. India where the earthquake occured last month is acountry(vì chỉ nơi chốn)

7. THe place where we spent our holiday was really beautiful (vì chỉ nơi chốn)

Xin CTLHN

$1$. December when it is coldest in USA is a month

$2$. John will never forget the day when he met Mary for the first time 

$3$. Danang where I was born and grew up is a city

$4$. London where we spent our vacation is a big city

$5$. The room where I am living is very nice

$6$. India where the earthquake occured last month is acountry

$7$. The place where we spent our holiday was really beautiful

`->`when: mệnh đề quan hệ chỉ thời gian

`->`where: mệnh đề quan hệ chỉ nơi chốn