An ecosystem consists of the living and nonliving things in an area ________ interact with one another.
| A．that | B．where | C．who | D．what |
Charles Babbage is generally considered ______ the first computer.
| A．to invent | B．inventing | C．to have invented | D．having invented |
I was too excited ______ .
| A．speak | B．to speak | C．not to speak | D．speaking |
"I usually go there by train." "Why not ______ by boat for a change?"
| A．to try going | B．trying to go | C．to try and go | D．try going |
"What do you think of the book?" "Oh. excellent, it's worth _______ a second time."
| A．to read | B．to be read | C．reading | D．being read |
People couldn’t help ______ the foolish girl.
| A．laugh at | B．to laugh at | C．laughing at | D．laughing : |