e want is an environmentally friendlycar, especially ____ is good on gas.

Do you know ______ this i-pad belongs to – Let me see. Oh, it’s ______.

Let’s learn to use the problem we are facing ______ astepping-stone to future success．

下列句子中，没有语病的一项是（ ）

I was very busy that dayOtherwise I _________in the discussion