1.这里表示目的 用不定式
改成主动是make full use of every second to go over our lessons
2.这里要考虑虚拟语气的搭配啦
had done...would have done
所以A如果是had been given就对了
3.否定词要放在不定式之前 想想not to do 是一样的道理
4.第一个空 AB都对
选A是find sb.doing结构
选B是fing sb.+adj.结构
第二个空 还原应该是her attention was fixed on a magazine显然是被动
所以选B