Something must be done to stop cutting down trees. ________ all the trees are cut down, the valuable soil will be washed away by the heavy rain.
Being examined twice a year, whether it is a car or a bus or a truck, is the rule that every driver _____ obey in this city.
On farewell party the foreign teacher gratefully _________ all the helps from all the school.
What do you think of the suggestion that she ________ at the meeting last week?
______ in her most beautiful skirt, the girl tried to make herself ______ at the party.
In front of our house ________ we used to swim.