You should spend about 20 minutes on this task. You now find that you cannot continue the course. Write a letter to your teachers
It seems that there is an article usage problem here.
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Use a variety of complex and simple sentences
You should use complex sentences in your writing, but it does not mean that you should try to make all of our sentences complex.
‘Complex’ sentences are not actually very complex; they are just two or more simple sentences put together. Putting them together makes the essay more coherent and cohesive.