单项选择题 After entering the Arabian house，you shake hands with（）person first，usually but not invariably the host.

单项选择题 Because of the awfully poor living conditions，black bears will be（）with various diseases.

单项选择题 The Education Ministry proposed guidelines to decrease the amount of the homework given to students each day，their burden is much heavier than what they can（）.

单项选择题 With refrigerators and freezers，we can（）a lot of different foods in our homes.

单项选择题 They are existing on pensions that are （）by the government.