15. Three quarters of the land here _____ wet land, an ideal place for migrating birds.
| A．are | B．is | C．have been | D．Being |
The cloth _______smooth and soft _______.
| A．feels; sells well | B．feeling; is sell sold |
| C．is felt; sells well | D．feeling; sells well |
Don't doubt the possibility we declared yesterday ____ we will surely win the game in spite of all the difficulties．
| A．that | B．which | C．when | D．whether |
The boss of the company is trying to create an easy atmosphere ______ his employees enjoy their work.
| A．where | B．which | C．when | D．who |
_____we understand things has a lot to do with what we feel.
| A．Where | B．How | C．Why | D．When |
It was so noisy that we _____ hear ourselves speak.
A. couldn't B. shouldn't C. mustn’t D needn’t