The words that correctly fill up the blanks in the sentences are given below:
1. Last week we took an exam.
2. It's only natural to make mistakes.
3. Do you enjoy doing speaking exercises?
4. I must do my homework before I watch TV.
5. Do we have to write an essay in the test?
6. It's important to memorize irregular verbs.
7. Good students usually study hard for exams.
Proper evaluation of the context of a sentence will help the reader to know the correct verb tense that should be inserted in the blank spaces.
In the first sentence, the past tense of the verb take is appropriate because the event occurred in the past.
Also, in the third sentence, the present continuous tense is used because the action is a continual one.
Therefore, the words provided are correct options for the blank spaces.
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