We appeal to all countries to _____cooperation on climate change, food security and the prevention of natural disasters.[ ]

The weather in Heilongjiang is much colder than _______ in Hainan.

You are wet through. You ___ in the rain.[ ]

Thesystem has been designed to give students quick and easy tothe digital resources of the library.

People who get less than six hours of sleep per night have an increased_____ of dying early