I _____ my university professor in the supermarket near my house, which was out of my expectation.
| A．came out | B．came across | C．came about | D．came along |
__________ parents say and do has a life-long effect on their children.
| A．That | B．Which |
| C．What | D．As |
__________ matters most in learning English is enough practice.
| A．What | B．Why |
| C．Where | D．Which |
Choosing the right dictionary depends on __________ you want to use it for.
| A．what | B．why |
| C．how | D．whether |
Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom.
| A．why | B．that |
| C．when | D．ours |
It is none of your business __________ other people think about you. Believe yourself.
| A．how | B．what |
| C．which | D．when |