___________ 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 |
______ it will do us harm or good remains ______.
| A．If; to be seen | B．Whether; to be seen |
| C．That; seeing | D．Whether; seen |
He is the only one of the students who _________ a winner of scholarship for 3 years.
| A．is | B．are | C．have been | D．has been |
Parents ____ bring up their children under 16 and educate them properly.
| A．could | B．may | C．might | D．ought to |
All of us found _____ necessary to learn a foreign language.
| A．this | B．that | C．it | D．what |
I used to _____ bed at nine. Now I am used to ____ bed at ten.
| A．go, going | B．go to, going to | C．go to, go to | D．going to, going to |