Верна ли грамматическая конструкция в данных предложениях? A) The most common problem is jet lag. B) Is flying the safest way to travel?

№ Верна ли грамматическая конструкция в данных предложениях? A) There is capital punishment for some crimes. B) Do you often walk in areas… № Who has __________________ it in time? № Labor rights __________________ integral to the social and economic development since the Industrial Revolution. № We __________________ our best yesterday. № We knew it __________________ raining. № A person who investigates the case is an __________________ .