求大家给十个左右的初二英语二单元I’ll help to clean up the city..的单选题

问题描述:

求大家给十个左右的初二英语二单元I’ll help to clean up the city..的单选题

Tom often volunteers in the hospital,and he thinks[helping]others[is]great.   2.When the students saw Mr.Wang coming into the classroom,they stopped[talking]