This is______difficult problem that few students can work it out.
| A．so | B．so a | C．such | D．such a |
We should eat _______ fruit and vegetables, but _______ meat. It is good for our health.
| A．more; less | B．more; more |
| C．less; more | D．less; less |
—Must we keep the window _______ all the time?
—No, you don’t have to.
| A．opening | B．opened |
| C．to open | D．Open |
Smoking can help you relax. But _______ it is also bad for your health.
| A．or | B．so |
| C．on the other hand | D．Then |
Some medicine is dangerous for children. Parents should put the medicine in places
children can’t _______.
| A．like | B．see | C．take | D．Get |
I can do many kinds of housework _______ cooking. I’ll learn it from my mother.
| A．for | B．without |
| C．except | D．Between |