Điền vào chỗ trống :     On Mother's Day sons and daughters visit their mothers and bring...........(1) flowers and little presents. The eldest son must.......... (2) his mother a good cake. If sons or daughters can not be ........... (3) their mother on that day, they usually......... (4) her presents.       Mother's Day must be a day of rest......... (5) the mother of the family, so her daughters........ (6) the dinnner on that day and lay the........ (7) and the sons help to ............ (8) the plates and dishes after dinner.       In the United States and Canada, Mother's Day is the second Sunday in May. They have a ...........(9) stamp for Mother's Day in the United States. Mother's Day is one  the important........... (10)