34. (After) the United States became independent, the cure of (more fertile )lands (drew steadily) New Ennglanders (into) the Ohio Vallye and the British colony of Upper Canada.
fertile 的比较级对么,c哪里错了
37. Among the (most complex )cryslals are( that) of silicon dioxide, which has seven (different) structures at varjous temperatures and pressures, the (most common being quartz.)
complex的比较级对么,b哪里错了