| A．have realized | B．has realized |
| C．have been realized | D．has been realized |
| A．Not the teacher but the students | B．Both the students and the teacher |
| C．Neither the teacher nor the students | D．Not the students but the teacher |
| A．am | B．be | C．is | D．are |
| A．has been put in | B．have been put in | C．being put in | D．to be put in |
| A．making | B．to make | C．make | D．makes |
| A．was destroyed | B．is destroyed |
| C．were destroyed | D．has been destroyed |
| A．is | B．has been | C．are | D．have been |
| A．has done | B．has been done | C．have done | D．have been done |
| A．is | B．are | C．was | D．were |
| A．has argued | B．has been arguing |
| C．have argued | D．have been arguing (争论，辩论，争吵，劝说) |
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