D. Lya told me to participate in the volunte Question 38. The problem is so difficult that he can't solve it. A. The problem is not easy and he can solve it. B. He doesn't solve the problem because it is so easy. C. The problem is too easy for him to solve. D. The problem is too difficult for him to solve. Question 39. What's the height of the mountain? A. How tall is the mountain? B. How height is the mountain? C. How high is the mountain? D. How high the mountain is? Question 40. You must work harder or you'll be sacked. A. If you work harder, you will be sacked. B. If you work harder, you won't be sacked. C. If you don't work harder, you won't be sacked. D. you mustn't work hard and you won't be sacked
