So fast _____that it is difficult for us to imagine its speed.
| A．light travel | B．is light travel | C．does light travel | D．travels light |
The good thing about children is that they _______ very easily to new environments.
| A．adapt | B．appeal | C．attach | D．apply |
It took ______ building supplies to construct these energy-saving houses. It took brains, too.
| A．other than | B．more than | C．rather than | D．less than |
Over the past decades, sea ice _____ in the Arctic as a result of global warming.
| A．had decreased | B．more than | C．attach | D．apply |
The medicine works more effectively ______ you drink some hot water after taking it.
| A．as | B．until | C．although | D．if |
There is a great deal of evidencethat music activities engage different parts of the brain.
| A． | indicate | B． | indicating | C． | to indicate | D． | to be indicating |