—Flight MU257 _______________ . I must be off now.
—Have a nice trip.
| A．is being announced | B．has announced |
| C．was announcing | D．had been announced |
—Hi, Tom, why are you looking so tired?
—I'm tried. Because I ______ the living room all day.
| A．painted | B．have been painting |
| C．have painted | D．had painted |
__________ is troubling me is __________ I don’t understand __________ he said.
| A．What; that; what | B．It; that; what |
| C．That; that; what | D．what; that; which |
______________________, I would have given you his address.
| A．If you asked me |
| B．You had asked me |
| C．Should you have asked me |
| D．Had you asked me |
As a teacher, he knows exactly how to his ideas to the students.
| A．consult | B．display |
| C．convey | D．comfort |
________ you can finish the task on time, it doesn't matter how you do it.
| A．So long as | B．As soon as |
| C．As well as | D．So far as |