You can spin, wheel and twist, but this thing can turn without moving. What is it?

Answer: Milk

Solution:

What force and strength cannot get through, I with a gentle touch can do. And many in the street would stand, were I not a friend at hand. What am I?

Answer: I am a Key.

Solution:

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I am a Key.

I live in a spooky castle or even in a cave, I sleep upside down and I am so creepy that people run because they’re scared. What am I?

Answer: A bat

Solution:

Sometimes I fly as fast as the speed of light. Sometime I crawl as slow as a snail. Unknown until I am measured but you will certainly miss me when I’m gone. What am I?

Answer: Time

Solution:

When is it bad luck to see a black cat?

Answer: When you are a mouse.

Solution:

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When you are a mouse.

When a girl was 7, her sister was 14, now the girl is 10. How old is her sister now?

Answer: 17

Solution:

Correct Answer: 17

Condition 1: 

Girl age = 7

Sister age = 14

So here age difference is 7 years

Condition 2:

Girl age =10

so Sister age = Girl age + 7=10+7=17

Hence Sister age is 17