________ is known to us all is that the old worker, for _______ life was hard in the past, still works hard in his seventies.
| A．As; whom | B．What; whose | C．It; whose | D．What; whom |
I would have come to see you earlier, but I __________ too busy.
| A．had been | B．were | C．was | D．would be |
With summer coming on, the weather gets hot _________.
| A．day after day | B．day and night |
| C．day in and day out | D．day by day |
In Switzerland, six miles west of Geneva,___________ a collection of laboratory buildings.
| A．lie | B．are lying | C．lies | D．lays |
America was____________ was first called" India" by Columbus
| A．that | B．where | C．what | D．the place |
To everybody's surprise, the fashionable young lady ___________ to be a thief.
A．found out B．proved out C, put out D．turned out