The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.
| A．who | B．when |
C．on which | D．Which |
Many companies give away small quantities of their produce as samples ______ people can try them before buying them.
| A．if | B．because | C．so that | D．since |
In the rainforest of the Amazon, 50 to 150 plant species ______ every day.
| A．are being destroyed | B．are destroying |
| C．have been destroyed | D．destroyed |
— This is a good place for a picnic.
— Yes, it couldn't be ____ .
| A．better | B．best | C．worse | D．worst |
He was very busy yesterday, otherwise he ____ to the meeting.
| A．would come | B．would have come | C．came | D．had come |
Education knows no limits. It___take place anywhere, whether in a kitchen or in the job.
| A．should | B．can | C．need | D．must |