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(a) He apologized about what he done.

(b) Ali was advised not to throw stones.

(c) He told the girl of the accident.

(d) He went to the supermarket to buy some sundries.

(f) When the security guard heard that, he took the boy to the office.

(g) He bought two bars of chocolates /a bar of chocolates.

(h)The manager warned the boy not to steal things again. The boy promised to the manager.

(i) He draws at home now.

The hawker cooks her food at the roadside.

(j) The doctor is checking (for) his patient.

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Vincent Teo(a) He apologized about what he done.

(b) Ali was advised not to throw stones.

(c) He told the girl of the accident.

(d) He went to the supermarket to buy some sundries.

(f) When the security guard heard that, he took the boy to the office.

(g) He bought two bars of chocolates /a bar of chocolates.

(h)The manager warned the boy not to steal things again. The boy promised to the manager.

(i) He draws at home now. Not sure what you mean.

The hawker ? cooks her food at the roadside.

(j) The doctor is checking (for) his patient.

The highlights show problems.

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A hawker is a street trader.
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Comments  
(a) He apologized about what he done.

(h) The boy promised to the manager.

(i) He draws pictures at home now.

The hawker ? cooks her food at the roadside.

Have you help me correct other sentences? How do I change the highlight parts?
He apologized FOR what he had done. (I missed the missing "had" before.)

The boy promised the manager. No "to."

What is a hawker?
Teachers: We supply a list of EFL job vacancies
 Feebs11's reply was promoted to an answer.
Then I guess she can good her food by the roadside. It sounds like a scene from an old book, though.