The doctor told me to take the medicine .
| A．every fourth hours | B．each fourth hour |
| C．each four hours | D．every four hours |
While ______ himself in the newspaper in a cafe , he got his pocket picked.
| A．having buried | B．buried |
| C．burying | D．to be buried |
— Can you explain ____ you have been late for school several times this term?
— Sorry, but it is the first time that I have been late this week.
| A．why it is that | B．how it is that |
| C．why is it that | D．how is it that |
Nowadays it seems to some of us that it is feeling, not just money, that is what really ________.
| A．counts | B．stays | C．means | D．grows |
When doing my homework,________.
| A．I heard the doorbell ring | B．the doorbell rang |
| C．my mother came in | D．my mother was cooking |
We have been looking at houses, but haven’t found _____ we like yet.
| A．ones | B．one | C．them | D．it |