At that time, he spent as much time as he can _______the ancient status which would be sank in the river.
It _______to John that he had left the door unlocked.
_______ Obama was elected president of the USA is a big success for the blacks in America.
It is reported that large amounts of locusts(蝗虫) _____ in their activity in the north now.
The actor pretends to be a fierce, bold man, but _____ he is timid and shy.
_____ makes that teacher famous is _____ over 92% of his students have been admitted to the state universities.