I received an invitation to dinner from my friend，and with my work ，I gladly accepted it.
| A．was finished | B．finishing | C．having finished | D．finished |
All the students in this school are required to ________ at least two lectures on how to study every month.
| A．attend | B．take part in | C．join in | D．join |
Your desk is covered with too many unnecessary things, including used papers and books. You’d better ________ some of them.
| A．remain | B．replace | C．remove | D．renew |
On arrival at the flood-stricken village, the PLA soldiers set ______ rescuing the villagers.
| A．for | B．out | C．about | D．off |
He gave us another piece of advice, ________ of great help to the research work.
| A．which I think is | B．which I think it is |
| C．I think which is | D．I think it is |
Only when _____ in the afternoon _____ able to leave.
| A．the match was over; they were |
| B．was the match over; were they |
| C．was the match over; they were |
| D．the match was over; were they |