问题：Frequent ______ is important: fixing or changing faulty parts of the propulsion system when necessary....
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问题：Tell me about a city you have visited.You should say:where the city is and when you went therewhat people can see and do in that citywhy that city is special and explain why your visit to that city was memorable.You will have to talk about the topic for o...
问题：You should spend no more than 40 minutes on this task. As part of a class assignment you have to write about the following topic. Millions of people every year move to English-speaking countries such as Australia , Britain or America , in order to study a...
