George could not ski or skate.
UNABLE
Besides ...................., George could not skate either.
I will not be able to get to work if George doesn't give me a lift.
UNLESS
.................... me a lift, I will not be able to get to work
It is a pity I cannot speak French.
WISH
I .................... speak French.
Who takes care of all these animals?
LOOKS
Who .................... all these animals?
Chris realised only then that he had lost his money.
DID
Only .................... that he had lost his money.
I have not seen Sarah since Monday
TIME
The .................... Sarah was on Monday.