Explanation

"On" is the correct preposition used with days of the week.

It shows the exact day something will happen.

Explanation

"In five minutes" means the action will be completed within that time frame.

It's the correct preposition for showing time needed to complete something.

Explanation

"Along the road" means moving in the same direction as the road, which suits walking.

It shows continuous movement beside or on the path, making it the best fit in context.

Explanation

"Behind" shows the correct position where the sun disappears from view in relation to the mountain.

It indicates the sun is going down out of sight on the far side of the mountain.

Explanation

Correct sentence: "All the charts will be displayed in the class and the group with the best drawing will be the winner."

"In the class" shows location; "with the best drawing" shows possession.

Explanation

Correct sentence: "A huge crowd is waiting outside the stadium…"

"Outside" shows position external to the stadium.

Explanation

Correct sentence: "…so that he can go on a month long tour of Europe."

"On" is used with journeys or tours.

Explanation

Correct sentence: "Ali went to the factory by himself."

"To" shows direction, "by himself" shows he went alone.

Explanation

Either of these two roads leads to the post office.

The phrase "either of" is followed by a plural noun ("these two roads"), but the verb should be singular ("leads"). 

Explanation

She had got home at 7 when I phoned. She had been at her mother's home.

جب میں نے فون کیا تو وہ 7 بجے گھر پہنچی تھی۔ وہ اپنی ماں کے گھر گیا ہوا تھا۔

The past perfect tense ("had been") 

Had been" shows a past action that happened before another past action (she got home).