| A．used to be transported/have been built up |
| B．used to being transported/have built up |
| C．was used to be transported/had been built up |
| D．was used to being transported/will be built up |
| A．was | B．had been | C．will be | D．have been |
| A．was more safely invested | B．is more safely invested |
| C．will be more safely invested | D．are more safely invested |
| A．will not have agreed | B．will not be agreed |
| C．will not agree | D．will not have been agreed |
| A．were repaired | B．would be repaired | C．will have been repaired | D．were being repair |
| A．took | B．are taking | C．take | D．have taken |
| A．be broken into | B．was broken into | C．had broken into | D．had been broken into |
| A．is | B．will be | C．had been | D．was |
| A．is going | B．had been | C．was about | D．is coming |
| A．Hardly would he reach school |
| B．Hardly had he reached school |
| C．Hardly he reached school |
| D．Hardly he was reaching school |
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