He had been so absorbed____ watching the car passing by that he didn’t notice his friends ____.
| A．to; coming | B．in; to come | C．on; coming | D．in; coming |
Although Anne is happy with her success, she wonders ________ will happen to her private life.
| A．that | B．this |
| C．it | D．what |
________ there are living creatures in the outer space as those on Earth hasn't been proved until now.
| A．How | B．When |
| C．Where | D．Whether |
We haven't settled the problem of ________ it is necessary for him to study abroad.
| A．why | B．whether |
| C．what | D．how |
It surprised us all ________ Kate made such big progress in this final exam.
| A．when | B．that |
| C．how | D．whether |
________ some teenagers don't realize is ________ difficult life can be after they get addicted to drugs.
| A．What; what a | B．That; how |
| C．What; how | D．That; what |