The scientist’s many years’ careful observation ____ a surprising discovery.
| A．ran into | B．began with | C．led to | D．came from |
The murderer was reported ______ by the court for his crime.
| A．putting to death | B．to have been put to death |
| C．being sentenced to death | D．to have sentenced to death |
Tom, I am very happy _____ you yesterday. I do wish I will have another chance to meet you.
| A．to treat | B．to be treating |
| C．to have treated | D．to be treated |
I have a busy life with no time to sit around _____ sorry for myself.
| A．feel | B．to feel |
| C．feeling | D．and felt |
I think I had at least a billion tests, including _____ in which they cut out a piece of muscle from my leg and looked at it under a microscope.
| A．that | B．the one | C．it | D．one |
With a lot of difficult problems _________, the manager felt like a cat on hot bricks.
| A．settling | B．to settle |
| C．being settled | D．settled |