—what do you think of Bill? —He is a hard-working student and he always ____himself in study.
________ many times, he finally understood it.
As a new diplomat, he often thinks of_____- he can react more appropriately on such occasions.
—Would you please help me with the box? —_________
David threatened_____ his neighbour to the police if the damages were not paid.
—How about your journey to Mount Emei?—Everything was wonderful except that our car _________ twice on the way.