The new actor was very nervous when he stood on the stage and his heart _________ so fast at that time.
| A．is beating | B．was beating |
| C．will beat | D．beat |
I prefer ________his new idea.
A．try out B．to try out C．trying out
He wanted _________ an inventor .
A．to be B．being C．is
___________ is better than to receive.
A．To give B．Give C．Have given
We have helped the animals in danger _________ it has still a lot of things to do .
A．so B．and C．but
Most of the pandas are living in the __________ .
A. nature Reserves B. Nature Reserves C. nature Reserves