He seems ____ something valuable. He looks so worried.
| A．has lost | B．to lose | C．to be losing | D．to have lost |
Either his wife or his friends __________ his birthday party.
| A．has attended | B．have attended |
| C．attends | D．is attending |
No one knows __________ it will be fine tomorrow and __________ we can play basketball together.
| A．whether; whether | B．that; whether |
| C．whether; that | D．that; that |
Loulan is believed __________ over by sandstorms gradually from AD200 to AD400.
| A．to cover | B．to be covered |
| C．to have covered | D．to have been covered |
They were having an argument about __________ turn it was to do the cooking.
| A．which | B．what | C．whose | D．who |
His son has __________ the running of his company, including six London theatres.
| A．taken up | B．taken off | C．taken on | D．taken over |