When a spacecraft travels, one of the major problems is reentry into the Earth ’s _______.
B
暂无解析
Some states in the United States _______ people tocarry guns.
Freemedicalserviceis_______tonearlyallthecollegestudentsinChina.
He_______tostudyharderinthefuturesothathecouldhavemoreopportunitiestofindabetterjob.
He tried to _____ __relations with his former wife but he failed.