Unit 4 Public transport单元练测卷建议用时满分实际用时得分错题档案90分钟120分Ⅰ.单项填空(共20小题;每小题1分,满分20分)1.Do you assume ________ he will come here tomorrow?A. whether B. ifC. that D. when2. ________ in the fields on a March afternoon,he could feel the warmth of spring. A. To walk B. WalkingC. Walked D. Having walked3.While it is good to be active,it can cause big troubles to be ______