People often think they are energetic and healthy and don’t need exercise. _______ , I have to warn that it is completely wrong.

These people were mentioned at the meeting,           , Tom, Helen and Brown.

—Mom，dad is smoking again!—Well，let him cut it ________ gradually since old habits die hard.

＿＿＿＿to my regret, I am unable to accept your warm invitation. 

We didn’t know you were in trouble at that time,_____ we would have given you a hand.