With more forests being destroyed, huge quantities of good earth _______each year.
I think it ______ that one have a good command of English if one wants to be engaged in international trade.
It was on May 12, 2008 ______ the Wenchuan Earthquake happened.
Mother told me ______ near the river.
His friends ignored his advice, ______ they knew it to be helpful.
I ______ along the road when I saw Peter. So we stopped and had a chat.