Question 13: It is not always easy to make a good ________ at the last minute. A. decision B. decide C. decisive D. decisively Question 14: Most of the children in his class felt tired after ________ trip to the countryside. A. a five-hours B. five-hours C. a five-hour D. five hours Question 15: The teacher wanted to know ________ me to do all those exercises. A. how long it took B. how long did it take C. how long does it take D. how long it takes Question 16: They ________ close friends since they first met at a party. A. were B. will be C. have been D. are Question 17: Your mother had to do the household chores by herself, __________? A. didn’t she B. hadn’t she C. wasn’t she D. doesn’t she Question 18: We should __________ deforestation to save wild animals and plants. A. increase B. prevent C. damage D. protect