Nuclear energy may be dangerous if
| A．controls | B．not controlling | C．not controlled | D．controlled |
—Do I need to give a tip if I eat at a fast food restaurant in the United States?
—Yes , it’s a commonto tip waiters in a restaurant.
| A．sense | B．custom | C．method | D．practice |
They all looked ____ at the master and felt quite _____．
| A．sad; sad | B．sadly; sadly | C．sad; sadly | D．sadly; sad |
The small victories in the fight against poverty and hunger have helped many people who are in trouble allowing them to maintain dignity.
| A．before | B．after | C．for | D．while |
Some pre-school children go to a day care center, __________ they learn simple games and songs.
| A．then | B．there | C．while | D．where |