1. Frank apologised to Ann for not coming to her birthday party, but she _______ his excuse at once. A. looked forward to
   B. looked through
   C. saw off
   D. saw through

Answer: D. saw through
Explanation: "Saw through" means to understand the true nature of something, which fits the context of Ann not believing Frank's excuse.

1. If they did move to Ho Chi Minh City, they’d stand _______ chance of getting a job. A. a much better
   B. much the best
   C. a better more
   D. a much more

Answer: A. a much better
Explanation: "A much better chance" is the correct phrase to indicate a significantly higher likelihood.

1. I got up the bus with some of my friends with whom I went to primary school. A B C D

Correction: A. got on
Explanation: The correct phrase is "got on the bus."

1. In the distance, there’s a coal-fired power plant which has made the city one of the A B C world most polluted. D

Correction: D. world's most polluted
Explanation: The possessive form "world's" should be used to indicate that the city is one of the most polluted in the world.

1. Is it true that taking regular exercise is as actually important as having a healthy diet? A B C D

Correction: C. actually as
Explanation: The correct phrase is "is actually as important as," placing "actually" before "as."

1. He turns down the job because it involved too much travelling, but later he regretted it. A B C D

Correction: A. turned down
Explanation: The correct past tense form is "turned down," consistent with "involved" and "regretted."

1. Flowing through southern England including London, Thames River is second longest. A B C

Correction: C. the second longest
Explanation: The correct phrase is "the second longest," using "the" to specify the ranking.