still,yet,already
1,he's ________been to beijing twice but he has never been to shanghai
2,i haven't done my homework_______.i'm________writing letters
3,will you_________be here tomorrow?
4,A:would you please wash the plates?
B:i've_____done it
5,drink it while it's_______hot
6,A:has li ming stopped sweeping the floor_______?
B:no,not_______
7,A:have you received a letter from your uncle?
B:yes.i've ______got it
最好解析一下