At last, we found ourselves at the foot of a hill with trees providing shade and ________ down to eat our picnic lunch.
| A．sitting | B．having sat |
| C．to sit | D．sat |
---- Tom came to work last Sunday, but no one has seen him since.
---- _____ he have had an accident?
| A．Must | B．Should | C．Might | D．Could |
I’ll go to your party___ you promise me that you will invite our class advisor.
| A．if only | B．only if | C．unless | D．since |
With the development of science and technology , more new technology____ to the fields of IT.
| A．has been introducing | B．is being introduced |
| C．is introduced | D．was introduced |
He took pity on the people in the flooded areas and___ his clothes and quilts to them.
| A．gave away | B．gave out | C．broke out | D．sent for |
The meaning of life ____ according to the nature of one’s life style.
| A．moves | B．changes | C．varies | D．turns |