______ tourism developing, more and more people prefer to go travelling for a holiday.
| A．As. | B．With | C．Upon | D．For |
If you turn your bag __________, the books will fall out.
| A．back to front | B．up and down |
| C．upside down | D．back and forth |
They failed several times, and they finally __________ the hope of finding an effective way of solving the problem.
| A．abandoned | B．released | C．discouraged | D．resigned |
Eliza remembers everything exactly as if it __________ yesterday.
| A．was happening | B．happens |
| C．has happened | D．happened |
All the teachers are against the idea to __________ the new teaching building beside the sports ground.
| A．find | B．set | C．locate | D．build up |
I am so busy that I have __________ unanswered letters.
| A．many a | B．a large amount of |
| C．masses of | D．a great deal of |