Cars do cause us some health problems——in fact far more serious ______ than mobile phones do.
| A．one | B．ones | C．it | D．those |
The seaside here draws a lot of tourists every summer. Warm sunshine and soft sands make __________ it is.
| A．what | B．which |
| C．how | D．where |
__________ 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 |