By the time he was ten, Edison _________ experiments in chemistry.
| A．had already done | B．already had done |
| C．was already doing | D．already did |
We’ll hold the speech contest in the school hall, which is large enough to ____ five hundred people.
| A．seat | B．shade | C．comfort | D．rest |
You ______ television. Why not do something more active?
| A．always watch |
| B．are always watching |
| C．have always watched |
| D．have always been watching |
Much to our ____, he didn’t do what he had promised.
| A．satisfaction | B．dissatisfying |
| C．satisfying | D．dissatisfaction |
She _____ an old friend of hers yesterday while she was shopping at the department store.
| A．turned down | B．dealt with | C．look after | D．came across |
A few _____ looked at him curiously when he suddenly stopped and burst out crying.
| A．passers-by | B．passer-bys |
| C．passers-bys | D．passer-by |