The toughest thing about success is ________ you have to keep on being a success.
All the Chinese workers do ________ they can ______through the hard time.
The new comer is from Japan, ________ I can tell from his appearance.
It was ________ that the PLA men got to the earth-strike area.
“You say you __________ do this, but I say, you ________ do it!” said the boss.
He didn’t make ________ clear when and where the meeting would be held.