| A．located | B．locating | C．to locate | D．is located |
| A．are gone | B．is being gone | C．goes | D．are going |
| A．when Tom comes back | B．when Tom will come back |
| C．before Tom comes back | D．that Tom comes back |
| A．we’ll learnt | B．we are learning | C．we have learnt | D．we’ll have learnt |
| A．are taken place | B．are to be taken place | C．took place | D．take place |
| A．has been traveling | B．has traveled | C．travels | D．is traveling |
| A．is changing | B．is changed | C．has changed | D．has been changed |
| A．did go | B．didn’t go | C．had gone | D．went |
| A．occur | B．have occurred | C．have been occurring | D．are occurring |
| A．am still to remember | B．have still been remembering |
| C．am being still remembered | D．still remember |
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