our earth, or else it will be no longer fit for us to live on.
| A．Protect | B．To protect | C．Protecting | D．Protected |
to frighten the poor man, Mrs Richards quickly hid under stairs.
| A．Not anxious | B．Anxious not |
| C．Being not anxious | D．Not being anxious |
Some insects_______ the colour of their surrounding to protect themselves.
| A．taken in | B．take off | C．take on | D．take out |
—We’ve spent too much money recently.
—Well, it isn’t surprising, Our friends and relatives_______ around all the time.
| A．are coming | B．had come | C．were coming | D．have been coming |
Joining the firm as a clerk, he got rapid promotion, and _______ as a manager.
| A．ended up | B．dropped out | C．care back | D．started off |
It seems that living green is _______ easy and affordable. A small step makes a big difference.
| A．exactly | B．fortunately | C．surprisingly | D．hardly |