A letter (post) __ today will probably reach him the day after tomorrow.
He rushed (danger) __ across the street to catch the bus.
Contrary to the opening up of Facebook, the Thunderbird can make users minimize ______.
There are many countries in the world where the water supply is not sufficient for the growing population, and other sources have to be found. Even the sea is used in some countries, but the problem of removing the salt is a severe one. Sea water can be used for a supply of drinkable water if it can be separated from the salt dissolved in it.
增长知识()搜集个人生活所需的信息
Exposure to all media is important because they all contribute materials for ______.