下列句子中，没有语病的一句是（ ）

The couple are spending their holiday on _____isdescribed as one of the most beautiful islands.

The split between humans and living apes isthought by some scholars ____ 15 to 20 million years ago

I’ll never forget the good trick my classmates ________ on me when I was in the primary school

Children are tired of learning often because they are________to do better than they can, both at school and at home.