To understand the grammar of the sentence，you must break it ________ into parts.
| A．up | B．down | C．off | D．out |
It isn’t an excuse for your failure ___________ you didn’t know the rules
| A．That | B．Because | C．Why | D．How |
_____________ we all know is that destroying nature means destroying ourselves.
| A．what | B．Which | C．That | D．It |
Fortunately, I was just _____________ to catch the last bus to the hotel.
| A．at times | B．too early | C．in time | D．too late |
There is a peaceful and calm _____________ in the hall, and everyone seems to be in high spirits.
| A．atmosphere | B．air | C．stage | D．performance |
____________ David says sounds right to Helen. That’s why she has made up her mind not to leave him _____________ happens.
| A．Whatever; whatever | B．No matter how; whatever |
| C．No matter what; however | D．Whatever; no matter how |