Do you know Earth Day?－Sure, it _______ in 1970 to tell us to protect our earth.

Do you think the Rockets will beat the Lakers ?—Yes . They have better players , so Ithem to win .

What about out for a picnic at weekend? —Good idea.

Mr. Lee spent the final time of his life in writing after finding out that he ________ soon.

I don’t know ______ with this problem. It’s too hard. — You can ask Mr Wang for help.