______ private cars are bringing us convenience, they also cause more traffic accidents and pollution.
| A．While | B．As | C．If | D．Since |
I’ve already told you that I’m going to buy it, ________.
A. how much does it cost B. no matter how it costs
however does it cost much D. however much it costs
They pretended ________ hard when their boss passed them.
A. to work B. being worked
to be working D. working
— Mary, let’s go to the lecture by Hawking, which is said to be very interesting.
— I’d like to, but I ________ finish the report first.
A. can B. may
must D. shall
After being broadcast on TV, the news was known by all ________.
A. at any time B. in no time
all the time D. at one time
It occurred to me ________ Jack might be interested in the problem we had discussed.
A. what B. why
how much D. that