It was ______ in the exam that ______ how much time I had wasted.
Everyone, please remain ____ until the plane has come to a complete stop.
I still remember ____ to the Summer Palace and what I saw there.
The scientist’s many years’ careful observation ____ a surprising discovery.
Don’t come and see me today – I’d rather you ____ tomorrow.
It is clear that your ____ English will greatly improve if you can practice ____ wherever you can.