Only ________ can you hope to make improvement in the operating system.
| A．by the way |
| B．on the way |
| C．in a way |
| D．in this way |
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 |