_________he is the son of the boss, he started from the lowest position as a common employee.
| A．Unless | B．Since | C．While | D．As |
It is none of your business ______ other people think about you. Believe in yourself.
| A．how | B．what | C．which | D．when |
This advertisement is a/an______ example of their marketing strategy
| A．average | B．specific | C．typical | D．flexible |
We must soon ______a new teacher to the class.
| A．adapt | B．appoint |
| C．exchange | D．abuse |
The tourists, had enjoyed themselves so much in the botanic garden, were worn out。
| A．all of what | B．all of which |
| C．all of them | D．all of whom |
We can hardly believe such a young boy ______ travel around the world all by himself.
| A．may | B．need | C．should | D．must |