．Never before______ so highly successful in his attempts to forecast the weather accurately on a small scale．
| A．man has been | B．man is | C．has man been | D．will be man |
. The mother didn’t know ___ to blame for the broken glass as it happened while she was out.
| A．who | B．when | C．how | D．what |
The flu is believed _______ by viruses that like to reproduce in the cells inside the human
nose and throat.
| A．causing | B．being caused | C．to be caused | D．to have caused |
It’s bad _______ for a man to smoke in the public places where smoking is not allowed.
| A．behavior | B．action | C．manner | D．movement |
--–And besides, these colors are more _______ you.
----Do you really think so? I’ll take it, then.
| A．becoming to | B．belonging to | C．referring to | D．used to |
.--–Mum, it is nice weather. I want to skate this afternoon.
----Don’t you think the ice on the lake is too thin to ______ your weight？
| A．stand | B．bear | C．catch | D．take |