Some researchers believe that there is no doubt ______ a cure for AIDS will be found.
| A．which | B．that | C．what | D．whether |
I woke up with ____________headache,yet by __________evening the pain had gone.
| A．the;the | B．the;an | C．a;the | D．a;an |
-___________you sing so loudly so late? Can`t you see it is already midnight?
-Oh,sorry.
| A．Can | B．Should | C．Must | D．Would |
Not until Mary reads her composition the second time ___________the spelling mistake.
| A．did she notice | B．she noticed | C．does she notice | D．she has noticed |
-Look! Someone __________sofa.
-Well,it wasn`t me.I didn`t do it
| A．is cleaning | B．was cleaning | C．has cleaned | D．had cleaned |
.I was about to get on the bus __________my wife phoned me to back home at once.
| A．when | B．while | C．until | D．after |