Freemedicalserviceis_______tonearlyallthecollegestudentsinChina.

Whentravelingaloneinthemountains,you’dbettertakea_______withyouincaseyougetlost.

Wewon’tallowanyforeigncountryto_______inourinternalaffairs.

He_______tostudyharderinthefuturesothathecouldhavemoreopportunitiestofindabetterjob.

Whenmakingmoderncameras,peoplebeganto_______plasticsformetal.