Here are the answers to the questions based on standard English grammar and vocabulary:

17. **A. has**
18. **B. But for the weather**
19. **C. Only because it was interested work**
20. **A. What will life on earth be like**
21. **C. skillfully works**
22. **A. when promoted well**
23. **B. ignore**
24. **D. preserve**
25. **B. to be cast**
26. **B. searching**
27. **A. I don't really use either.**
28. **C. I can't stand it**
29. **B. funny**
30. **C. easily**

**Identify the mistake in each sentence:**
1. **C. a bit**
2. **B. little**
3. **C. worth**
4. **C. part**

Feel free to ask if you have more questions!