The central heating system of this office building is down and several workers ______ it right now.
| A．had repaired | B．have repaired | C．repaired | D． are repairing |
Which person do you refer to, the one with ________ long hair or the one with _______ long beard?
| A．a, a | B．不填，不填 | C．a, 不 | D．不填，a |
"I've never found a better job." "_________."
| A．I don't think so | B．Too bad | C．Congratulations | D．Don't worry |
"She's not a dancing teacher, is she?" "________."
| A．Yes, and she isn' | B．Yes, but she was |
| C．No, but she isn't | D．No, but she was |
Jim is ___ person, and everyone is willing to be ______ with him.
| A．so kind a, friends | B．so a kind, friends |
| C．so kind a, friend | D．so a kind, friend |
They kept trying _________ they must have known it was hopeless.
| A．if | B．because | C．when | D．where |