Explanation

The correct phrase is keen on when expressing interest or enthusiasm.

“She is keen on learning new languages” is the grammatically correct construction.

Explanation

"Lucid" means expressed clearly; easy to understand.

Since "everyone understood immediately," the explanation must have been clear and easy to follow. 

Explanation

He devotes much of his time to planning for the future 

 وہ اپنا زیادہ تر وقت مستقبل کی منصوبہ بندی میں صرف کرتا ہے

Subject: "He"

Verb: "devotes"

The object of the verb: "Much of his time"

Gerund Phrase (acting as a noun): "Planning for the future"

Explanation

If she were free, she would talk to you 

 اگر وہ فارغ ہوتی تو آپ سے بات کرتی

Formula for second conditional: If + past simple, would/wouldn't + verb.

Explanation

I cannot come to see you until tomorrow.

"Until" is the correct choice, as it refers to a point in time when something will happen.

It indicating that the speaker cannot visit before tomorrow.

Explanation

Polygot means a person knows many languages.

Polygot means ایسا شخص جو بہت سی زبانوں پر عبور رکھتا ہو

Explanation

They played football yesterday.

انہوں نے کل فٹ بال کھیلا۔

Since it’s past tense, the correct verb is played.

Explanation

He does not like mangoes.

اسے آم پسند نہیں ہیں۔

Correct form (present tense negative): does

Since it’s a negative in the present tense for he/she/it, use does.

Explanation

Usually in is used after trust or "believe".

We trust in one God

means ہم ایک خدا پر یقین رکھتے ہیں

so the option "in" is best to keep the meaning of the original sentence.

Explanation

We generally use in after harm.

No harm in + ing form of a verb کوئی حرج نہیں

There is no harm In meeting him.

اس سے ملنے میں کوئی حرج نہیں۔