Not until the early years of the 19th century____ what heat is.
| A． man did know | B．man knew | C．didnot man know | D．did man know |
We need to think outside of box _____ we are to come up with something really new.
| A．so that | B．as long as |
| C．once | D．if |
— Is this the painting ____ you offered $1,000 for on the Internet?
—Yeah,I will give you 15% discount if you like it.
| A．when | B．which |
| C．as | D．what |
The temperature will fall sharply the day after tomorrow,when a snowstorm____to strike our area.
| A．expects | B．has expected |
| C．is expected | D．will be expected |
—Go and have great fun!I will cope with ______you leave to me properly.
—Thanks a lot.
| A．why | B．when |
| C．what | D．which |
Kate paid him in advance,which_____ was a mistake.
| A．no more | B．no doubt |
| C．no wonder | D．no luck |