Don’t be too rude to your father. Never in his life _____ in that way.
| A．has he spoken to | B．he has spoken to |
| C．has he been spoken to | D．he has been spoken |
If you __ go, at least wait until the storm is over．
| A．can | B．may | C．must | D．will |
It is human activities on the earth that are to _______ global warming.
| A．be blamed for | B．to blame for | C．take charge of | D．be responsible with |
I like the house with a beautiful garden in front, but I can’t afford______．
| A．one | B．this | C．it | D．that |
His glasses, _____he was like a blind man, were broken.
| A．with which | B．with it | C．without which | D．without it |
Experiments of this kindin both the U．S．and Europe well before the Second World War．
| A．have conducted | B．have been conducted |
| C．had conducted | D．had been conducted |