All the staff in our company are considering to the city center for the fashion show.
| A．going | B．having gone |
| C．to have gone | D．to go |
Why _______ you leave with Lucas now? There are still two days left before you go to work and you can stay with us for more time.
| A．should | B．shall | C．could | D．must |
It wasn’t _______ he took off her mask _______ I recognized he should be a famous film star.
| A．when; that | B．until; when |
| C．until; that | D．when; then |
—Mr Johnson, _______ a second chance, I will finish the task as planned.
— OK, don’t let me down this time.
| A．giving | B．given | C．to give | D．give |
_______ human beings use it in a wrong way, like we did with nuclear technology, the advancement of science and technology has never led to decline of human development.
| A．While | B．Unless |
| C．As long as | D．Before |
—I’m afraid the project may be several days behind schedule due to bad weather.
—Don’t worry. Three more assistants will be _______ in no time at all.
| A．at your convenience | B．at your command |
| C．at your risk | D．at your request |