—How do they ----（relax） on Sunday?—They often sing some son

—How do they relax（relax） on Sunday?—They often sing some songs and dance.
因为主语是they,是复数
所以谓语动词用relax
再问： Turn left on the first turning还是Turn left at the first turning
再答： Turn left 【at】 the first turning at比较好