Welcome to the Historical Museum, everyone! This stone knife _______ in South Africa and experts can’t be exactly sure about its use.
| A．had been found | B．was found | C．has been found | D．would be found |
As the mid- examination is coming , the students are busy ____ it.
| A．preparing | B．prepare for | C．prepare | D．prepareing for |
—You were brave enough to raise objections at the meeting.
--Well , now I regret ____that.
| A．to do | B．to be doing | C．to have done | D．having done |
Bamboo grows best in the place _____ it is warm and rains often.
| A．which | B．where | C．that | D．as |
–Did you ask the guard what happened?
--Yes, he told me all ______ he knew.
| A．about which | B．which | C．that | D．what |
Look! The dictionary , _____is red , is a birthday gift given by Father.
| A．which cover | B．the cover of which |
| C．the whose cover | D．that the cove |