You may use the book as you like, _______ you keep it clean.
| A．unless | B．so long | C．as long | D．so long as |
She tried hard to keep calm in face of the students, but the sweat on her forehead _____ her ____.
| A．gave; away | B．tuned; down | C．showed; out | D．shut; off |
After retirement, Mr. Smith ______ painting, which he had always loved but had not had time for.
| A．took up | B．got up | C．help up | D．looked up |
You’d better ______ some hot water into the bottle in case the teacools down.
| A．add | B．fill | C．fill in | D．put |
Thomas Alva Edison didn’t “invent” the light bulb (灯泡), but rather he ______ a 50 –year –old idea, which is not well –known.
| A．improved upon | B．take down | C．put up | D．break away |
Dressed untidily and speaking in a strange way, Father must have ______ to the people present to be a silly old man.
| A．appeared | B．pretended | C．shown | D．thought |