-Did you hear someone talking in the living room?
-Oh, I forgot to __________ the TV just now.
| A．switch on |
| B．turn on |
| C．switch over |
| D．switch off |
There were beautiful clothes________in the shop windows.
| A．spread | B．displayed |
| C．exposed | D．located |
_______you study hard，you’ll succeed in time.
| A．As far as | B．As long as |
| C．As good as | D．As well as |
He tried his best to solve the problem，________difficult it was.
| A．however | B．no matter |
| C．whatever | D．although |
Measures have been taken to prevent the river from____．
| A．having polluted | B．being polluting |
| C．being polluted | D．to pollute |
Children often display an________curiosity about every new thing they encounter.
| A．impossible | B．unreliable |
| C．extra | D．incredible |