Is this the reason____ at the meeting for his carelessness in his work?
| A．he explained | B．what he explained |
| C．how he explained | D．why he explained |
Cars do cause people some health problems, in fact far more serious _____ than computers do.
| A．one | B．it | C．ones | D．those |
____ under the tree was a charming girl aged about seventeen and eighteen.
| A．Sat | B．Sitting | C．To sit | D．Sit |
_____ the city’s public school system should be open to the children of migrant workers has become the focus of discussion.
| A．Whether | B．What | C．That | D．If |
On seeing_____ gift they wanted, the kids screamed with _____ delight.
| A．/; a | B．a; the | C．the; / | D．the; a |
—I just can't stop worrying about the result of my medical examination.
—＿＿．There’s nothing you can do now but wait.
| A．Sit back and relax | B．Watch out for it |
| C．Just a moment | D．Take your time |