——Why couldn’t they catch the 6:30 train ?
——Because they were delayed by .
| A．some heavy traffics | B．heavy traffic |
| C．a heavy traffic | D．any heavy traffic |
John’s ability to learn from observations and experience_______ greatly to his success in public life.
| A．owed | B．attached | C．related | D．contributed |
--- Is there any possible way to help them get rid of such a bad habit?
--- To tell the truth, it’s very hard. But we teachers _______on this problem.
| A．are working | B．had worked | C．worked | D．had been working |
--- Why were you absent yesterday?
--- I caught a cold, _______I had been walking around in the rain.
| A．but | B．so | C．and | D．for |
A subway is an effective way to solve traffic problems in_________big city. It has evident advantages, such as_______speed and convenience.
| A．the; the | B．a; the | C．a; / | D．the; a |
It’s the ability to do the job _______ matters not where you come from or who you are.
| A．one | B．that | C．what | D．it |