We _________ last night, but we went to the concert instead

must have studied

might study

should have studied

would study

While listening to the concert, the audience is required to remain _________ and keep quiet．

seated

to be seated

seating

to seat

Last Christmas my father gave me so interesting a book as a present _________ nothing else could match．

that

as

where

which

Nearly three months had gone by _________ the seriously injured girl showed a slight sign of recovery．

until

after

since

before

The buildings in this modern city are growing tall, some even reaching over 400 meters _________ height．

in

for

at

on

Millions of young people are so _________ about the so-called “Singles Day” that even websites like Taobao have special sales on November 11．

particular

positive

enthusiastic

cautious

Mary's _________ was whether to go to the graduation ball in her old dress or to stay at home．

ambition

concept

panic

dilemma

So fascinating an event _________ that it is now enjoying world-wide reputation．

does the Carnival prove

the Carnival proves

proves the Carnival

the Carnival is proven

_________ Wu Ping is a person who is willing to help, he doesn't have much time available, I am afraid．

Since

When

While

Unless

Despite all the benefits of building a factory here, only a few people argued _________ the project．

in terms of

in need of

in praise of

in favour of