One of the responsibilities of the Coast Guard is to make sure that all ships______followtraffic rules in busy harbors.
B
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Inordertobuyanewcar,youshouldatleast______onehundreddollarsaweek.
Mrs.Smithlockedboththefrontandthebackdoorsbeforeshewenttobed______thatsomeonemightstealintothehouseatnight.
Many patients insist on having watches with them in hospital, ______ they have no schedules to keep.
On arriving home, the boy told his parents about all the ______ which occurred in his dormitory.