He wrote a letter ________ he explained what had happened in the accident.
A. what B. which C. where D. as
Tom took a taxi to the airport, only _______ his plane high up in the sky.
A. finding B. to find C. being found D. to have found
—Have you heard about the recent election?
—Sure, it _______ the only thing on the news over the last three days.
A. would be B. is C. has been D. had been
Don’t treat the vase as if it _______ made of steel.
A. is B. was C. were D. had been
Although we met with some difficulties in building the railway, we were still _____ about finishing it before the deadline.
A. consistent B. enthusiastic C. responsible D. optimistic
There are some health problems that, when _____ in time, can become bigger ones later on.
A. not treated B. not being treated C. not to be treated D. not having been treated
