Use the words in the box to complete the sentences.
(LAN; WLAN; nodes; peer-to-peer; hub; backbones; server)
1. All the PCs on a … are connected to one … , which is a powerful PC with a large hard disk that can be shared by everyone.
2. The style of … networking permits each user to share resources such as printers.
3. The star is a topology for a computer network in which one computer occupies the central part and the remaining … are linked solely to it.
4. At present Wi-Fi systems transmit data at much more than 100 times the rate of a dialup modem, making it an ideal technology for linking computers to one another and to the Net in a … .
5. All of the fibre-optic … of the United States, Canada and Latin America cross Panama.
6. A …. joins multiple computers (or other network devices) together to form a single network segment, where all computers can communicate directly with each other.
2.What you was reading when they came in?
3.While I was diging in the garden ,I hurt my arm.
4.I waited for my flight yesterday morning.
5.How fast she drived when the accident was happening?
6.We were had a dinner when she called.
7.At 10.35 we played tennis in the club.
8.She writing letter at 6 p.m last evening.
9.Her father went to the art gallery when he was meeting her mother.
10.At 8.20 yesterday morning my mother drove me to the university.
11.They sat at the cafe at that time.
12.She was studying in the library when they suddenly called.
Не знаю правильно или нет,но хоть что-то.
1) The most common environmental problems are pollution, global warming, deforestation, natural resource depletion, waste disposal and loss of biodiversity.
Наиболее распространенными экологическими проблемами являются загрязнение окружающей среды, глобальное потепление, вырубка лесов, истощение природных ресурсов, переработка мусора и сокращение биологического разнообразия.
2) Breathing in polluted air is very bad for people's health.
Вдыхание загрязненного воздуха очень вредно для здоровья людей.
3) People should stop cutting down so many trees and start protecting forests.
Люди должны прекратить вырубать так много деревьев и начать защищать леса.
4) We produce too much waste every day and recycle too little.
Мы производим слишком много отходов каждый день и перерабатываем (для повторного использования) слишком мало.
5) We all should walk or cycle as much as we can to help reduce energy use and carbon dioxide (CO2) emissions.
Мы все должны ходить пешком или ездить на велосипеде как можно больше, чтобы сократить потребление энергии и выбросы углекислого газа (CO2).