We were swimming in the lake _______ suddenly the storm started.

Why don’t you ____ it to his attention that you are too busy to go on working?

I can’t fix my mind on my study, with thechildren ______ so noisily outside my window.

The meeting _______ because of the fog in Northern China last week.— Oh, it’s too bad! We should take action to improve the air quality.

The father as well as his three children _______ skating on the frozen river every Sunday afternoon in winter.