As an English teacher in high school, maintaining your professional ________by constantly updating your knowledge is something most vital and essential．
| A．dimension | B．competence |
| C．extension | D．Proportion |
The magician picked some persons from the audience _____ and asked them to help him with the performance．
| A．by accident | B．in vain | C．at random | D．on average |
Let's find a placewe can wait out the snowstorm．
| A．where | B．which | C．what | D．when |
Barack Obama delivered a speech to 500 local youths during his visit to China，many ofwere from Fudan University and Tongji University．
| A．them | B．whom | C．which | D．those |
Chinadaily. com. cn is the largest English portal site in China，news，business information and learning materials．
| A．to provide | B．provide | C．provided | D．providing |
Everyone who helps in the business will surely get their _____ in the profits．
A．shares B．attention C duties D．concern