.______ the beginning of the 19th century did scientists know that all matter is made up of 
atoms.
| A．At | B．By | C．Up to | D．Not until |
—Tom, you are caught late again.
—Oh, __________.
| A．not at all |
| B．just my luck |
| C．never mind |
| D．that's all right |
I can judge that they __________ the enormous risks involved.
| A．skimmed |
| B．observed |
| C．overlooked |
| D．glanced |
__________ and out of breath, we reached the top of the mountain and stopped __________ the beautiful scenery.
| A．Tiring; to admire |
| B．Being tired; admiring |
| C．Tired; to admire |
| D．Tired; admiring |
If we all agree to make __________ with each other when we are in disputes, wars are forever gone and we are surely live in peace.
| A．adjustment |
| B．compromise |
| C．promise |
| D．acquaintance |
(2011·甘肃)—Do you need any help, Lucy?
—Yes. The job is __________ I could do myself.
| A．less than |
| B．more than |
| C．no more than |
| D．not more than |