After making the necessary changes and substituting the direct object a with the one in parentheses, the sentences are appeared to be :
1) The expensive blouse looks good on you.
2) Popular songs annoy them.
3) Not interested in learning to swim?
4) They love the mall.
5) We have a few weeks of school.
6) They don't mind looking for some of our books.
Here the direct object is referred to as a noun that receives the action of the verb, whereas the direct object should be confused with the subject ( the noun that performs the action or the verb itself).
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