Some insects __________ the colour of their surroundings to protect themselves.
| A．take in |
| B．take off |
| C．take on |
| D．take out |
Deeply _______, I thanked her again and again.
| A．being moving | B．moved | C．moving | D．to be moved |
_______ the house on fire, he dialed 119.
| A．To see | B．Seeing | C．Having seen | D．Being seen |
_______ how to do the homework, I went to ask my teacher for help.
| A．Not to know | B．Not knowing | C．Knowing not | D．Not known |
We advised them to take a rest, but they insisted _______ the work.
| A．finish | B．to finish | C．in finishing | D．on finishing |
I've never heard the word _______ in spoken English.
| A．use | B．used | C．using | D．useing |