The world (not face) such a big challenge since World War II.
China (win) lots of high praise since we turned the sand into forests.
Jim has never been (be) to Mount Tai in China.
Recently, more and more people (realize) that clear waters and green mountains are the same valuable as mountains of gold and silver.
Linda (sleep) on the bed when the doorbell rang.
He sent me a few messages, but I (not reply) yet as I don't know what to say.
Uncle Chen (repair) more than five bicycles since last Friday.
"I (fail) over and over again in my life and that is why I succeed, " said Michael Jordan, a famous basketball player.
So far, the couple (not change) their flat since they had a second child.
I (not finish) my homework yet. I am afraid I can't go to the park with you.
The only way to do great work is to love what you do. If you (not find) it yet, keep looking.
How can I trust you? You've (lie) to me again and again.
Stephen Hawking (die) for over 3months, but his spirit still lives on.