Although ______ for many years, the two old sisters recognized each other at once.
-Young man, come off the grass; we forbid________ on the grass here. -Sorry, I didn’t notice it.
Christina wasn’t saying anything, but the professor smiled at her _______she had done something very clever.
No matter what I do, my efforts ________always end in failure.
The factory used 65 percent of the raw materials, the rest of which _____ saved for other purposes.
There’s nothing more important than good health, _______?