. The little boy is dirty from head to foot because he ___ in the mud all morning.
| A．had played | B．has played | C．was playing | D．is playing |
Niki is always full of ideas, but is useful to my knowledge.
| A．nothing | B．no one |
| C．neither | D．none |
Little Tom sat watching the monkey dancing in front of him.
| A．amaze | B．amazing |
| C．amazed | D．to amaze |
The exhibition tells us we should do something to stop air pollution.
| A．where | B．why | C．what | D．which |
Andy is content with the toy. It is he has ever got.
| A．a better | B．the better |
| C．a best | D．the best |
There is only one more day to go your favorite music group play live.
| A．since | B．until | C．when | D．before |