—__________ are those pants?
—They are 100 yuan.
| A．How many | B．How much | C．What | D．How |
David, get up early, _______ you'll not catch the early bus.
| A．but | B．and | C．after | D．Or |
She has studied in this school she was seven years old.
| A．since | B．if | C．until | D．after |
The Great Wall is famous lots of visitors all over the world come to visit it every year.
| A．so; that | B．such; that |
| C．enough; that | D．very; that |
__________ it’s very difficult, remember not to give up until the last minute.
| A．Until | B．Unless | C．Although | D．Since |
You will never know the result ______ you try it by yourself.
| A．when | B．if | C．unless | D．after |