Liu Xiang announced the retirement (退役) in Shanghai _______ May 17, 2015.
More and more young people In China celebrate ________Christmas Day December 25th. A at B. on C. in
The_______ of most trees will fall in autumn. A leaf B. leafs C leaves
You ______ wear sports shoes when you climb a mountain.
Thomas wants to know ______Nina lives.
He didn’t go there yesterday, _______he?