She __________ an old friend of hers yesterday while she was shopping at the department store.
----I have never heard it _____ before. And you ? ----The same as you.
In the dark street, there wasn’t a single person _____ she could turn for help.
We found Mary’s brother to have _____ more story books than Ann’s.
If you _____ the medicine you _____ better now.
Gone forever ____ when we used foreign oil.