I have been living in the United States for twenty years, but seldom___ so lonely as now.[ ]

The old lady is reminded to _____ for cars when shecrosses the road.[ ]

it to your school is really anunforgettable experience, Iwill always treasure.

This was ____ anyonehad previously sailed alone

Tom should not be sent to____ the task, for a start he hasn’t had enough experience.