Lisa in the kitchen when you called her at 5 o’clock in the afternoon.
We will celebrate the 90th birthday of the Chinese Communist Party _____ July 1st, 2011.
We must______ using plastic bags in order to protect our earth..
Parents often ask us _____ water in our life.
E - mail is very popular today. People hardly post letters, _____?
Our country ______the sixth population census(人口普查) already.