A greenhouse is a building _______ of glass _______ for keeping plants warm when the outside temperature is low..
________I was in trouble, he would come to help me out.
—Tom loves surfing the Internet. —______ and ______.
Over 20% of the students at that school _____ the habit of smoking, which is beyond imagination.
I will never forget the day _____ we spend together.
----Where shall we go first? ---- According to ____ schedule of the journey, firstly, we’ll visit ____ temple, the guide told us.