Mary liked to look back on her high—school days, she thought were the happiest in her life.
| A.that | B.what | C.which | D.when |
We often talk a great deal about English language teaching, ______ that it is the learning that really matters.
| A.having forgotten | B.forgotten | C.forgetting | D.to have forgotten |
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 |