-Can you help me with the maths homework, mom?
-You can't always ________others' help for your homework.Do it by yourself this time, dear.
| A．wait on | B．rely on | C．insist on | D．turn on |
It has been widely accepted that only when the students take an active part in the class activities _______ the most effective.
| A．teaching will be | B．will teaching be |
| C．has teaching been | D．teaching has been |
. With the whole village _______, the villagers had to move to higher land, waiting for help.
| A．flooding | B．having flooded |
| C．flooded | D．to be flooded |
The UN does not have its own army. _______, it borrows soldiers from different countries.
| A．Moreover | B．Anyhow | C．Instead | D．Somehow |
. A nature reserve for white-flag dolphins was set up in 1992, _______ boats have been
prohibited from sailing around since then.
| A．where | B．which | C．when | D．what |
It is surprising that Jack, who is only 39 years old, _______ in the field of engineering for 20 years when he entered the company last month.
| A．worked | B．had worked | C．has worked | D．working |