________our earth，or else it will be no longer fit for us to live on.
| A．Protecte | B．To protect | C．Protecting | D．Protect |
相关试题
China’s economic development has made rapid progress in the past years and young people have made great contribution to this progress．
| A．/ ; a | B．the; / | C．a; a | D．/ ; / |
Who would you rather _____ the meeting instead of you?
| A．attend | B．have attend | C．have attended | D．have to attend |
On the table _____ two dictionaries．You may look up the word in either of them．
| A．lie | B．lays | C．laid | D．lies |
My English teacher is really ___．She is often seen working in her office far into the night．
| A．warm-hearted | B．easy-going | C． hard-working |
D．self-confident |
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