The research lacks evidence, and therefore, its conclusions are doubtful.
You’d better get the second-hand car ________ before you sell it.
They believe that there is _________ in the world.
---How about going for a walk after supper?-----__________.
Frank, with his two sisters, ________ London by train which ________at 8:30 next morning.
--- I know you are an expert in skincare.---________, but I do know something. So how can I help you?