-----They used to be good friends, but now they are like strangers. ----- How _____ this ______?
| A．were; come about | B．did; come about |
| C．were; taken place | D．were; happened |
Rather than _______ on a crowded bus, he always prefers _______ a bicycle.
| A．ride；ride | B．riding；ride | C．ride；to ride | D．to ride；riding |
Charles Babbage is generally considered ________ the first computer.
| A．to invent | B．inventing | C．to have invented | D．having invented |
. He said he would rather not _______ it right now.
| A．doing | B．to do | C．do | D．to be doing |
I’m hungry. Get me something _________.
| A．eat | B．to eat | C．eating | D．for eating |
--- 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 |