It _____ last night., because the ground is all wet 

The boy insisted that he __________ nothing wrong and that he __________ at once.

— Wow! You look different! You            wear glasses.— Yes, I did. But now I am wearing contact lenses(隐形眼镜).

At last the boy was made      and began to laugh.

-Listen! Is Mary playing the piano in the room?  --No. It ________ be Mary. She has gone to Hong Kong.