With all the family members ______ on vacation without him, the boy felt extremely lonely and afraid.
| A．to have gone | B．going | C．had gone | D．gone |
— That’s the third time he’s won the award in this field.
— Yes. He ______ his maximum potential in the past decade.
| A．explored | B．is exploring | C．has been exploring | D．has explored |
It is clear that in modern society high _______ and demands are placed on students.
| A．motivations | B．expectations | C．standards | D．opportunities |
___ himself in carrying out an experiment, he can’t spare time to look after his children.
| A．Occupied | B．Having occupied | C．Occupying | D．Having been occupied |
This argument sounds reasonable, but ___________ it’s incorrect.
| A．fortunately | B．actually | C．naturally | D．obviously |
This dictionary, which I bought yesterday, has been highly _______ by my professor.
| A．acknowledged | B．appealed | C．recommended | D．commanded |