After hard work, he felt __________ tired to walk.

---Why would some workers in Foxcon die __________ continue working in the factory?  ---Psychologists say they are under too much pressure. 

How time flies! It’s almost three years _______ we met last time.

 —What do you think of your boss?—He ’s kind-hearted. Not only _______ what to do, but also he lent me money.

The red suitcase is expensive ______it’s made of leather.