________ I accept that he is not perfect, I do actually like the person[ ]

Mr. Smith didn’t understand _____ made his son so upset that evening.

Why are the elephants very__________—Because they can walk for a long time and never get lost.

ceremony, the president delivered a thank-you speech ______ the company.

They__________on the program for almost one week before I joined them, and now we ________on it as no good results have come out so far.