______ I toured Zhangjiajie, I was deeply impressed with its beautiful scenery.
| A．For the first time | B．At first |
| C．It was the first time | D．The first time |
Assistance dogs are trained to help disabled to live more independent life.
| A．/; a | B．a; the | C．the; the | D．the; a |
_______ they may have, the CEO of the corporation calls on all the staff to gather their courage to strive it.
| A．What a serious problem | B．However a serious problem |
| C．How serious a problem | D．Whatever a serious problem |
Fortunately, what the witness reported to the police on the phone led to ___________.
| A．the suspect's being captured | B．capture the suspect |
| C．the suspect having captured | D．be captured by the suspect |
The new lecture course differs from the old one, ________ the students aren't required to attend lectures.
| A．which that | B．that | C．which | D．in which |
When you have a job interview, it's ________ you're dressed that sets the tone of it.
| A．however | B．how | C．what | D．whatever |