He waited ________ the volcano became quiet and he was able to return two days later.
| A．when | B．before | C．as | D．until |
Encourage your children to try new things, but try not to ______ them too hard.
| A．draw | B．strike | C．rush | D．push |
Play, often ______ as an activity for younger children, is still important in the social development of teenagers.
| A．to see | B．seeing | C．seen | D．to be seen |
Your ideas are very interesting, but we need ______ suggestions to get us out of the mess.
| A．impressive | B．similar | C．traditional | D．practical |
To my understanding, a high school graduate has already reached a point in his/her life ______ he/she is supposed to make decisions of his/her own.
| A．which | B．where | C．how | D．why |
He is not native; if he were, we ______ this discussion over his identity.
| A．would not be having | B．are not having |
| C．had not had | D．will not have |