China has _____ area of about 9,600,000 square kilometers, including Diaoyu Island(钓鱼岛) .

Our country _______ a lot in the last fifty years.

I found ___________ hard to remember all the twelve star signs because they are difficult to pronounce(发音) and spell.

I’m going to invite my friends a party tomorrow.[ ]

Before I talked with ______ scientist, I had never met______ clever person like him.