Among the children ______ the professor telling stories.
| A．sit | B．sat | C．has sat | D．had sat |
In some places, red indicates sadness, as in South Africa, _______ it is the color people wear when they mourn.
| A．which | B．where | C．when | D．what |
The fans _____the names of the band members when they appeared at the airport.
| A．had screamed out | B．were screaming out |
| C．would scream out | D．have screamed out |
He is really nervous. He ______back and forth all the night waiting for the results.
| A．has been walking | B．had walked |
| C．walked | D．is walking |
Mary _______as a secretary in this company for twenty years and now she stays at home taking care of her own garden.
| A．has served | B．had served |
| C．is serving | D．served |
The company invested 80 percent of the money in training the staff, the rest of which ____saved for other purposes.
| A．is | B．are |
| C．was | D．were |