Please tell me how to work out thismaths problem— Use your ______ , then your find a way

Global warming is a big _______ for all and it’simportant to raise awareness about climate change

Though working outside, he is always about his aging mother at home.

just can’t imagine how people living here __________ the polluted environment. — Something must be done to change this situation.[ ]

He worked hard to some money for his retirement.