We should _____ the power when our TV or computer is not used.
| A．turn on | B．turn off |
| C．turn up | D．turn down |
Every day we spend half an hourmorning exercise。
| A．do | B． to do | C． for doing | D． doing |
The building is the secondin our town。
| A． high | B． highest | C． higher | D． the most highest |
His father is engineer. He designed such useful machine
| A．a an | B．an a | C．an an | D．a a |
—Who is speaking there?
—It be Uncle Li. He has gone to Shanghai.
| A．must | B．can’t | C．might | D．should |
— Amy’s library book is lost?
—She has to pay for it.
| A．In the end | B．What if | C．Instead of | D．Why not |