When he was a boy, he used to go there and watched _______.
| A．repairing bicycles | B．to repair bicycles |
| C．bicycles being repaired | D．bicycles to be repaired |
—How long are you staying?
—I don’t know. ______.
| A．That’s ok | B．It depends | C．Never mind | D．It doesn’t matter |
Whatever work you are doing, you should concentrate your attention ______it.
| A．to | B．towards | C．with | D．on |
The incomes of skilled workers went up. _____, unskilled workers saw their earnings fall.
| A．Moreover | B．Therefore | C．Meanwhile | D．Otherwise |
______in a proper way, waste can be turned into useful things.
| A．To deal with | B．Dealt with | C．Dealing with | D．Being dealt with |
It’s helpful to put children in a situation______ they can see themselves differently.
| A．when | B．which | C．that | D．where |