The silence of the library is sometimes broken by a sudden cough or the sound of pages _____.
| A．turning | B．turned | C．being turned | D．having turned |
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
Collecting stamps as a hobby___________ increasingly popular during the past fifty years.
| A．becomes | B．became | C．has become | D．had become |