It is suggested that the key _______ the world's environment should be _______ a low carbon economy right now.
| A．to protect; to expand |
| B．to protecting; to expand |
| C．of protecting; expanding |
| D．to protect; expanding |
—We 'll go camping tomorrow morning, I promise.
—Maybe by then you your mind.
| A．changed | B．are changing |
| C．will have changed | D．have changed |
Soon after the results were announced, our teacher sent us an e-mail, congratulating us our success.
| A．for | B．on | C．of | D．with |
matters most is they can finish the task on time.
| A．That; if | B．What; what |
| C．That; that . | D．What; whether |
— Would you like to spend the vacation in Paris with me?
— I' d like to you pay for me.
| A．unless | B．because | C．Provided | D．as |
Our neighbors gave a baby bird yesterday that hurt when it fell from its nest.
| A．us； it | B．us ；itself |
| C．ourselves；itself | D．ourselves；it |