Experiments of this kind ___in both the U．S and Europe well before the Second World War．
| A．had conducted | B．have conducted |
| C．have been conducted | D． had been conducted |
Mr. Smith told his son _____ the football match because of the exam.
| A．not to watch | B．to not watch |
| C．not watching | D．doesn’t watch |
Neither the headmaster nor the teachers _____ take a vacation next week.
| A．were going to | B．is going to |
| C．was going to | D．are going to |
The boy has a good habit to _____ all the things in right places.
| A．put away | B．put up |
| C．take away | D．take up |
--- How is Tom now?
--- I hear the company _____ him a good job, but he refused it.
| A．provided | B．offered |
| C．passed | D．introduced |
--- ______will the invitations be sent to our guests? --- In three days.
| A．How often | B．How soon |
| C．How long | D．How far |