What time do we have to be at the gate of the museum? — ______ the visitors begin to check in[ ]

Mary was disappointed when she found outthey had gone to the cinema_____ her.

He likes playing tricks on others, but _______, he is a good boy because he is willing to help others.

Public attention at the moment is ______ on the problem of how to create opportunities for the laid-off workers

He moved to the USA in the late 1630s and left a(n) of his reason for his leaving.