It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.
| A．process | B．attention | C．measure | D．part |
When I entered the classroom, I saw the students _____ in their seats.
| A．sitting | B．are sitting | C．sat | D．to sit |
I would really _____ it if you could offer me the chance to study abroad.
| A．thank | B．make | C．like | D．appreciate |
I wonder how he _______ that to the teacher.
| A．dare to say | B．dare saying | C．not dare say | D．dared say |
My grandfather spends most of his time _______ because he loves nature.
| A．outdoor | B．outdoors | C．indoor | D．indoors |
You won’t be______ by the host to the wedding ___ you are a good friend of his.
| A．advised; unless | B．admitted; if | C．invited; unless | D．impressed; if |