-Can I come to see you at ten o'clock, John?-I'm sorry, Jo, but I __________ my uncle then.
In such a fierce competition, a person has to make every effort if he ______.
Only when ______ possible to settle the problem.
I was told that there were about 50 foreign students ____ Chinese in the school, most _____ were from Japan.
You look very tired. You ____ late last night.
_____is known to us all is that the old writer for ____life was hard in the past , still works very hard in his eighties.