Food safety is ______ important, so the government spares no efforts to prevent food pollution.
The traffic accident wouldn’t have happened yesterday, but the driver _______ really careless.
I had expected to come over to see you last night, but someone ______ and I couldn’t get away.
We had wanted to come to see him, but we ____ no time.
We had hoped that you would be able to visit us, but you _____.
We had hoped to catch the 10:20 train, but _____ it was gone.