She ______ behind the door in order not to be found. Two minutes later she was safe again.
. You must be there within an hour. There should be no _______ in sending the information.
Mike told me that you would pay a visit to Japan, ______?
. One third of the area ______ covered with trees. About seventy percent of the trees ______ been planted recently.
Nowadays teens prefer going to the net-bar ______ they can chat with their friends by QQ or play computer games ______ some more reading.
It has been announced that all the students ______ put on the masks before going to school in case they are infected with SARS virus.