Question 23. Unless he apologizes, I'll never invite him here again.
A. If he doesn't apologize, I'll never invite him here again.
Question 24. If you don't study harder, you will surely fail the next exam.
D. Unless you study hard, you will surely fail the next exam.
Question 25. Unless he phones her immediately, he won't get information.
A. If he doesn't phone her immediately, he won't get information.
Question 26. The children will go swimming if it is sunny.
C. It is sunny, the children will go swimming.
Question 27. Unless the presentation is ready soon, we'll have to back out of the project.
B. If we don't complete the presentation, we'll lose the project.
Question 28. If the weather is fine, we'll go hiking this weekend.
C. We won't go hiking this weekend if the weather is bad.
Question 29. If you work hard, you will pass the exam.
D. Unless you work hard, you will fail the exam.