So difficult ___________ it to live in an English-speaking country that I determined to learn English well.
| A．I have felt | B．I felt |
| C．I did feel | D．did I feel |
Not until the train pulled into the next station ________ her suitcase gone.
| A．Mary had found | B．had Mary found |
| C．Mary found | D．did Mary find |
He hurried to the booking office only ______ that all the tickets had been sold out.
| A．told | B．to tell | C．to be told | D．telling |
The problem lies_______ we are now giving him a fish, not teaching him to fish.
| A．in that | B．in which | C．on which | D．at which |
When ____ comes to saving energy, big changes start with small steps, like turning off the lights.
| A．that | B．this | C．it | D．one |
Of the two cameras, I would prefer ________ one, which is very easy for me to carry.
| A．a smaller | B．the smallest | C．a small | D．the smaller |