Answer 13: A. wear. Explanation: The sentence is in the past tense, and the verb 'asked' is in the past tense, so we need to use the past tense form of the verb 'wear', which is 'wear'.

Answer 14: A. looked after. Explanation: The sentence implies that the father took care of the son, so the correct phrasal verb is 'looked after'.

Answer 15: C. does he. Explanation: The sentence is a question, and the structure of the question requires the use of an auxiliary verb before the subject, so the correct option is 'does he'.

Answer 16: D. was painted. Explanation: The sentence is in the passive voice, and the verb 'paint' is in the past tense, so we need to use the past tense form of the passive verb 'be painted', which is 'was painted'.

Answer 17: A. dish. Explanation: Chung cake is a Vietnamese dish that is traditionally eaten during the Lunar New Year.

Answer 18: B. of. Explanation: We feel proud 'of' something, so the correct option is 'of'.

Answer 19: D. It's my pleasure. Explanation: This is a polite response to express gratitude for being invited to the party.

Answer 20: A. pass. Explanation: The sentence is in the present tense, and the verb 'wish' is followed by the present simple tense, so we need to use the base form of the verb 'pass', which is 'pass'.

Answer 21: C. funny. Explanation: The sentence implies that Tim has a good sense of humor and can make people laugh, so the correct option is 'funny'.

Answer 22: D. any. Explanation: The sentence implies that there is no water in the bottle, so we need to use the negative form of 'some', which is 'any'.

Answer 23: B. whose. Explanation: The sentence is describing the photos, which are in the possession of 'my mother', so we need to use the possessive pronoun 'whose'.

Answer 24: C. but. Explanation: The sentence implies that Lan was absent from school because she was ill, so we need to use the conjunction 'but' to show the contrast between her being absent and her being well.