One learns a language by making mistakes and________ them.
| A．correct | B．correcting | C．corrects | D．to correct |
It took building supplies to contruct these energy—house . 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．decreased | C．has been decreasing | D．is decreasing . |
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 evidence that music activities engage different parts of the brain .
| A．indicate | B．indicating | C． to indicate | D．to be indicating |
The system has been designed to give students quick and easy to the digital resources of the library .
| A．access | B．passage | C．way | D．approach |