I was at a loss what to do next when an excellent idea suddenly` _______ me.
| A．knocked at | B．occurred to | C．happened to | D．knocked down |
The trouble is ____ we can not find such an expert.
| A．why | B．that | C．where | D．/ |
People may have different opinion about Karen, but I admire her. ______, she is a great musician.
| A．After all | B．As a result | C．In other words | D．As usual |
I am sure ____ you said is true.
| A．what | B．that | C．which | D．who |
There was such long queue for coffee at the interval that we ________ gave up.
| A．eventually | B．unfortunately | C．generously | D．purposefully |
— Must I turn off the gas after cooking ?
— Of course . You can never be____careful with that .
| A．enough | B．too | C．so | D．very |