The writing brushes __________ bamboo and animals' hair.
| A．are made of | B．is made from |
| C．is made of | D．are made up |
| A．wouldn’t | B．couldn’t | C．mustn’t | D．needn’t |
| A．slept | B．was sleeping | C．have slept | D．am sleeping |
| A．Unless | B．While | C．Now that | D．Even if |
Two years later, her brother disappeared in the war, never ________ again.
| A．having been heard from | B．to be heard from | C．to hear from | D．being heard |
I would appreciate it if you tell me the way you thought of ______ the difficulties,
| A．smoothing away | B．to smooth away |
| C．doing away with | D．to smooth over |