You can come to me for help _____ difficulties you face
Our teacher told us _________ too much noise in class.
He had ________ money, so he asked his mother for some.
– When did the terrible earthquake in Wenchuan happen?-- It happened _________ the afternoon of May 12, 2008.
Boys, don’t touch the machine, or you may hurt _________.
Mrs. Green usually goes shopping with _____ umbrella in ______ summer.