Supply the missing prepositions.
He was born ..... a poor family, and his parents couldn’t afford to send him to school.
Although he tried hard, he wasn’t able to keep ........with the rest of the class
They didn’t have enough evidence ........ hand to prove they were right.
Signing the treaty is central..... the restoration of peaceful relations between the two countries.
She didn’t turn ..................., so I decided to go in by myself.
Airport warning notices remind passengers to keep an eye on their luggage .................. all times if you don’t want to get robbed.