用many,much,little,few,more,less,fewer填空

用many,much,little,few,more,less,fewer填空
The------carefully you think,the-------mistakes you'll make n the exam.
There are------people in the countryside than in the cities because people can find work-----easily in the cities.
Toby often talks-----but does------,so he is not so popular with his classmates.
A more less B much few C less more D few many
Do you often hear from-----?
A Tom B Tom‘s C Tom's letter D Tom's letters
We will surf the Internet after school.
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