This coastal area a national wildlife reserve last year.
The reason why he didn't come to school was ________ he was ill.
Does ________ matter much if they do not come tomorrow?
The bell ____ the end of the period rang and we had to stop our discussion
One-third of the area ________ covered with trees. About seventy percent of the trees _______ been planted recently.
Neither Tom nor his parents ________ at home.