Experiments of the kind ____ in both the U.S. and Europe well before the Second World Wall.
| A．have conducted | B．have been conducted |
| C．had conducted | D．had been conducted |
---May I have a look at the menu for a while?
---Of course, ______, sir.
| A．take your time | B．enjoy yourself |
| C．it doesn’t matter | D．don’t worry |
parade
| A．major | B．ancestor | C．probable | D．National |
designed
| A．astonished | B．limited |
| C．stopped | D．Combined |
strength
| A．gather | B．clothing |
| C．smooth | D．birthplace |
celebration
| A．religious | B．secret | C．poet | D．Envelope |