Since they betrayed us, they have no hope of convincing ________ their sincerity.
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They assured us that ________ was waiting for they were there to share it.
A what
B whatever
C it
D whoever
________ exposure to dirty air can cause people suffer from some diseases.
A Raised
B Prolonged
C Expanded
D Enlarged
________ about one of the most rapidly changing countries in a ceaselessly changing world is not all easy.
A Being informed
B To be informing
C Have in formed
D Informed
Though you stay in the sea for weeks, you will not ________ contact with the outside world.
A lose
B fall
C miss
D fail