彷徨爱情
on the other hand, some of us are lazy and not good at our lessons.有一点要说清楚,最后的their应该改成our,因为你前面的主语是some of us,如果按照你原来的句子,就属于偷换主语了。这可是写作文的大忌!~~或者,你也可以把前面的改成some students第二个空,之所以填good,是因为它后面有个at,be good at sth 是个固定短语
芥末花vera
On the other hand ,some of us _are lazy___and _not industrious_____ at their lessons.