C. more strict: "More" is used to form the comparative degree of the adjective "strict," so it should be "more strict" instead of "more stricter."

1. Who is the stricter teacher you have ever had? A. stricter: "Stricter" is the comparative form of "strict," used to compare two items.

2. They are opening a new shopping mall downtown now. B. opening: "Opening" is the correct form to indicate an action happening at the present moment.

3. A: What was the weather like? B: It wasn't very good at all. A. wasn't: "Wasn't" is the contraction of "was not," which is the appropriate form for negating the sentence.

4. Her speech was so boring that most people fell asleep. B. boring: "Boring" is the correct adjective to describe something uninteresting or dull.

5. I've lived here since 1990. A. since: "Since" is used to indicate the starting point of an action or event in time.

6. Jim has just come back from the USA. A. just: "Just" is used to indicate a very recent action or event.

7. On Valentine's Day, many people send flowers and cards to say they love each other. C. Valentine: "Valentine" is the correct term for the holiday celebrated on February 14th.

8. Tonight I will put up the decorations for the party. B. put up: "Put up" means to place or hang something in position, which fits the context of decorating for a party.

Find and correct one mistake:

1. People at work are very friendly and outgoing. "Friend" should be changed to "friendly" to match the noun "people."

2. Did the woman have any English money with her? "Had" should be changed to "have" to form the correct past tense question.

3. He is shorter and thinner than I am. "Thiner" should be changed to "thinner" to form the correct comparative degree of the adjective "thin."

4. Have you ever seen the latest 4G phone yet? - Yes, I have. "Do" should be changed to "have" to form the correct affirmative response in the past perfect tense.

5. I hate playing basketball with that team. "Play" should be changed to "playing" to form the correct gerund form of the verb after "hate."

6. He is taller and bigger than I am. "Biger" should be changed to "bigger" to form the correct comparative degree of the adjective "big."

7. Where does your father usually start work? - At seven o'clock. No correction needed.

8. You shouldn't go out late on weekends. "To" should be removed after "shouldn't" to form the correct structure of the modal verb "should."

9. Our parents have lived here for fifty years. "Since" should be changed to "for" to indicate the duration of time rather than the starting point.

10. We didn't meet her in the library yesterday. "Don't" should be changed to "didn't" to form the correct past tense negative statement.

11. Suddenly I saw an accident when I was driving a car. "See" should be changed to "saw" to form the correct past tense verb in the context of narrating a past event.