When asked what they would volunteer to do, ________ said they were willing to do something they could.
| A．half of these | B．half of which |
| C．half of whom | D．half of them |
One well of the oil field was still burning with huge fire twisting crazily____ the night sky.
| A．in | B．on | C．against | D．across |
— They are said to have been familiar with each other.
— But they_________. They were introduced only hours ago.
| A．may not have been | B．couldn’t have been |
| C．mustn’t have been | D．needn’t have been |
Nowadays mobile internet devices are pushing up demands for online education, which makes people see it as one of the most____ new market.
| A．demanding | B．confidential | C．promising | D．controversial |
— Haven’t seen you for ages! Where have you been?
— I____ in Xinjiang for one year, volunteering services as a doctor.
| A．have stayed | B．stay | C．stayed | D．am staying |
Look, ___beautiful flowers the girl ___carrying that she becomes the focus in the room.
| A．such; is | B．so; are | C．how; is | D．what; are |