_______ I went to the South Lake in Hanzhong, I was deeply impressed with its beautiful scenery.
| A．For the first time | B．The first time |
| C．At first | D．It was the first time |
It was not until he came back _____ he knew the police were looking for him.
| A．which | B．since |
| C．that | D．before |
It was ten o’clock _____ he came back home.
| A．when | B．that |
| C．since | D．after |
Was _____ that I saw last night at the concert？
| A．it you | B．not you |
| C．you | D．that you |
It is _____ my father worked _____ I work now.
| A．where, that | B．where, when |
| C．that, where | D．that, that |
It is the protection for the trees _______ really matters, rather than how many trees are planted.
| A．what | B．that |
| C．不填 | D．which |