Circle the mistake in each sentence

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Exercise 6: Circle the mistake in each sentence.
1. The students do some experiments at the moment.
A. students
B. do
C. at
2. What do you usually do at your free time?
A. What
B. usually
C. at
D. free
3. You should practise speak English before you go to England.
A. should
B. speak
C. before
D. go
4. They never read or study on the same time.
B. or
C. on
A. never
5. She is very good of writing essays.
A. is
B. very
C. of
D. moment
D. same
D. writing