—I bought this shirt for 35 yuan yesterday. —It’s on sale today for only 29. You should have waited. —Oh, really? But how ________ I know?
Even the best writers sometimes find themselves ___ for words.
The old couple often take a walk after supper in the park with their pet dog ___.
At the end of the day he is totally ___ and sleeps well at night.
___experience, he is no more skillful than Alice in practical operation.
When we ___ electricity, we get heat from an electric heater.