Food safety is important. Rules _____ to stop people from food pollution.

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

Who has broken the window in my room?— Who else ________ it but your naughty boy?[ ]

It is said that the conference will last _______ three to four hours and include a meal.

What should we pay more attention to if we go north in winter, Mum?—Nothing muchTake warm clothes_________ the weather is cold