He knows China very well. That is,he has__ good understanding of___ Chinese history.
I was really anxious about you.You ________ home without a word.
There was a lot of fun at yesterday's party.You ________ come,but why didn't you?
He ________ if he works hard for the people.
He ________ fatter but he eats too little.
I________to my cousin's birthday party last night, but I was not available.