The doctor’s dilemma was _____ he should tell the patient the truth.
| A．whether | B．which | C．that | D．what |
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 |