If people ______virtual reality holidays, we ______ on an around-the-world tour．
| A．invent; go | B．invented; had gone |
| C．invent; have gone | D．invented; would go |
Biology is _____.
| A．science of life | B．science of the life | C．the science of the life | D．the science of life |
_____ of them knew about the plan because it was secret.
| A．Some | B．Any | C．No one | D．None |
"How many elephants did you see?" "_____".
| A．None | B．No one | C．Not many ones | D．No many |
I remember _____ word he said that day.
| A．all | B．both | C．each | D．every |
One of the students hasn’t prepared _____ lessons very well.
| A．one’s | B．ones | C．their | D．his |