Explanation

By the time he was thirty, he had won many tournaments.

Explanation

Under one's signature is the correct option. 

Under one's signature means confirmed with a signature. 

Explanation

The correct sentence would be: "The farmers set about ploughing early in the morning."

"Set about" is an idiomatic expression that means to begin or start doing something.

Explanation

Read a magazine 

Explanation

 Further means more, extra or new.

Explanation

Liable for means responsible for

Liable for ذمہ دار قرار دینا

Liable to means entitled to.

Liable to مستحق

You are liable to fine means تم جرمانے کے مستحق ہو

Explanation

The complete sentence is:
"The teacher continued me on my spelling."

The preposition "on" is used to indicate a subject or focus,

Explanation

In front of something means کسی چیز کے سامنے

Explanation

We use "trained in" a subject or skill.

"Trained in first aid" is correct usage.

Explanation

In "Dark They Were, and Golden-Eyed" by Ray Bradbury,

The characters see old cities on the Martian hills.

The discovery of these cities contributes to the sense of wonder and unease experienced by the colonists as they grapple with the changes occurring in their new environment.