—Kathy and her sister are so alike.—I can’t tell one from ____.
Take a taxi , _____ you'll miss your train .
If you _____ stop smoking , you can only expect to have a bad cough .
There must be _____ book which could help .
I hope _____ the job she's applied for (申请) .
_________ last as his coach suggested, he wouldn’t have narrowly escaped being killed.