When my grandfather retired(退休) at the age of 60, he took a sea ________ around the world, which had been his dream since his childhood.

— How are you, my dear?— Not so well． I've ___ the flu．

I tried hard to get some information about the new technology out of his mouth, but he remained_________．

The girl being a child of _______ intelligence, expecting too much of her would make her nervous.

We are using so many raw materials every day, which _______ that they _______.