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 |
He introduced the neighbour _____ he is getting on well to me.
| A．of whom | B．with whom | C．about whom | D．to whom |
______，the pay isn't attractive enough，though the job itself is quite interesting.
| A．Generally speaking | B．On the contrary | C．In particular | D．To be honest |
I’m afraid he’s more of a talker than a doer, which is _____he never finishes anything.
| A．that | B．when | C．where | D．why |
–Have you handed in your schoolwork yet?
--Yes, I have. I guess it ________ now.
| A．has graded | B．is graded | C．is being graded | D．is grading |
He dived in the water and _____ to search for his girlfriend’s lost gold ring.
| A．caught his breath | B．held his breath | C．lost his breath | D．took breath |