Now, the world’s focus is all on Shanghai ______ the 2010 world Expo is to be held.
Of the seven days in a week, Saturday is said to be the most popular ______ for a wedding in some countries.
. If you think that the illness might be serious, you should not ______ going to the doctor.
--- Did you get ______ job that you were interviewed for?--- No. John was ______lucky dog.
. The boy was sitting at the desk, ______ hard when his mother got home.
. ______ the house costs, it will be ______ it.