There seems to be two causes as I try to figure out __________ that prevents so many children from being as happy as before.
We have reached a stage _________we have almost no rights at all.
The little boy_____be very naughty, but he is very lovely.
he referred to in his article was unknown to the general reader.
It is not immediately clear the financial crisis will soon be over.
A terrible flood hit Gongshang in Yunnan province, 200 persons.