More and more people like shopping online. They mostly receive what we buy by_______.
| A．Internet | B．air |
| C．express | D．train |
He ______when the UFO arrived. He didn’t wake until the UFO disappeared.
| A．slept | B．was sleeping | C．was doing homework | D．was singing |
He said that light ______much faster than sound.
| A．has travelled | B．went | C．travels | D．travelled |
I won’t pass the exam ______I work hard.
| A．whenever | B．because | C．if | D．unless |
I like music that I can dance _______.
| A．from | B．by | C．with | D．to |
In the past the children were made ______15 hours a day.
| A．to lock | B．work | C．to work | D．lock |