The first two questions are rather difficult,but the last is easy.(只有三个问题的情况下,剩下一个,那就是the last is)或者
The first two questions are rather difficult,but the rest are easy(问题不止三个,所以除了前两个难,剩下的都很简单,用are)
The first two questions are rather difficult,but the last is easy.(只有三个问题的情况下,剩下一个,那就是the last is)或者
The first two questions are rather difficult,but the rest are easy(问题不止三个,所以除了前两个难,剩下的都很简单,用are)