---______, the floor is really slippery.
---Thank you for reminding me.
| A．Mind your step | B．Walk slowly | C．Mind your feet | D．Come this way |
Scientists in some countries have done a lot of work to _____ the moon.
| A．cover | B．search | C．explode | D．explore |
She does not know _____ the situation, for she is too inexperienced.
| A．how to deal with | B．what to deal with |
| C．how to deal with it | D．what to do with it |
I know these flowers are not natural, but the _____ ones look more beautiful and can last long.
| A．fresh | B．new | C．true | D．artificial |
Cattle’s two ____ help them to digest food and their fur to keep them warm.
A stomaches B heart C stomachs D hearts
Great attention must be paid ____ welfare, especially in the poor area.
| A．develop | B．to develop | C．to developing | D．developing |