-- Why do you look so worried?
-- My computer broke down and my essay _____ since.
| A．has been left unfinished | B．has left to finish |
| C．was left to finish | D．had been left unfinished |
Flowers suddenly burst out everywhere on the same day every spring, as if they in tune with one another.
| A．are | B．were | C．have been | D．are to be |
The kangaroo was lucky. It just missed .
| A．catching | B．to be caught | C．to catch | D．being caught |
His bright tie made him in the crowd.
| A．stand by | B．stand for | C．stand out | D．stand up |
In the near future, more advances in cloning technology by scientists.
| A．are making | B．are made | C．will make | D．will be made |
He had collected plenty of historical evidence, proved that humans used to have different sleeping patterns.
| A．that | B．which | C．it | D．what |