Winter holidays will begin _____ January 17.
The car is running ________ its lights ________.
Please call me 872─4458.
-- Sally, you must introduce your friend ___________ me. -- OK, I will.
--Do you know when the London 2012 Olympic Games will start?--It will start ________ July 27th, 2012. You can visit London that summer.
The group of trees provided some shade ______ the sun .