My wife and I __________ you __________ what you have achieved in America.
| A．celebrate； on |
| B．congratulate； on |
| C．congratulate； for |
| D．celebrate； for |
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 |
After ______ was about then minutes, the teacher gave the students the correct answer to the question.
| A．what | B．that | C．it | D．which |