I failed in the spoken examination last term and only then _______ the importance of practicing speaking English.
—Tom lost his job last week.—___he is wandering in the street these days.
The witnesses(证人) of the accident said that the lorry _______ very fast at the crossroads when the accident happened.
._____ nothing is doing ill.
Our monitor talks about Mars as if he ______ a scientist.
Your floor is dirty. It needs _______.