Explanation

The Great Wall of China was built mainly to protect against invasions from northern tribes like the Mongols.

It served as a military barrier and lookout system across China's northern frontier.

Explanation

"Goes" is the present simple tense of the verb "go".

It describes a habitual or regular action happening in the present.

Explanation

"Salar was a kind and helpful boy by nature."

Key Tip:

Use "by nature" for inherent characteristics.

Use "in nature" for literal references to the natural world.

Example:

By nature: "She is curious by nature."

In nature: "Lions live in nature."

Explanation

Explanation

The name Nashrah is of Arabic origin.

The meaning of the name Nashrah is "to spread out," "to open," or "to expand."

It is derived from the Arabic word "Nashr" which means "spreading" or "expanding."

Explanation

Abandon means ترک کرنا

Explanation

Collinear points are points that lie on the same straight line.

Example: Points A, B, and C on a ruler are collinear if they form a straight path.

Explanation

Describe means بیان کریں

Explanation

Disguise means بھیس

Covering means ڈھانپنے

Explanation

Current temperature is -3°C, and it drops by 4°C.

So, -3 - 4 = -7°C — the new temperature.