| A．are built | B．build | C．have built | D．have been built |
| A．are being worked | B．are working | C．have been working | D．have been worked |
| A．had only covered | B．covered | C．would only cover | D．would be only covered |
| A．shall be to perform | B．will be to perform |
| C．are to be performed | D．are to perform |
| A．shall have | B．had had | C．are having | D．have |
| A．I’ll see | B．I see | C．I can see | D．I’ll be seeing |
| A．ought to be not allowed | B．ought not to be allowing |
| C．ought not to have allowed | D．ought not to be allowed |
| A．starting | B．to start | C．have started | D．was starting |
| A．will be going to build | B．is going to be built |
| C．will be gone to build | D．is gone to be built |
| A．brought | B．has brought | C．had brought | D．was bringing |
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