Now there’s a system _________ the waste is disposed of using the principles of ecology.
| A．when | B．which | C．that | D．where |
Take care of yourself! You can leave the hospital when you have completely _______from your illness.
| A．returned |
| B．rescued |
| C．replaced |
| D．recovered |
There are so many kinds of delicious cakes that I can't decide_______．
| A．what to buy |
| B．to buy what |
| C．which to buy |
| D．to buy which |
Mr Smith is in poor health. As a result, his wife _______ him to smoke and drink.
| A．forbids |
| B．allows |
| C．forgives |
| D．persuades |
The treatment will continue until the patient reaches the point _______he can walk safely.
| A．what |
| B．where |
| C．which |
| D．how |
--- How can you keep slim as a mother of two?
--- I have been _______in the gym for years.
| A．working out |
| B．carrying out |
| C．getting out |
| D．giving out |