New ideas sometimes have to wait for years before _____.
| A．being fully accepting |
| B．fully accepting |
| C．having fully accepted |
| D．fully accepted |
His letter was so confusing that I could hardly make any ______ of it.
| A．explanation | B．meaning | C．sense | D．guess |
I don’t think there will be many students left in the class，_______，because the conditions are not fit for studying.
| A．if any | B．if possible | C．if ever | D．if so |
It was not until he came back _____ he knew the police were looking for him.
| A．which | B．since | C．that | D．before |
His uncle went abroad in 2010, and _______since.
| A．has not been heard of | B．had not been heard of |
| C．had not heard of | D．has not heard of |
His letter was so confusing that I could hardly make any ______ of it.
| A．explanation | B．meaning | C．sense | D．guess |