I had to catch my flight. That was ________ I left Tom’s party so early yesterday.
A. whatB. howC. whyD. when
Beijing’s new international airport ________ into use in 2019, according to the spokesperson.
A. was putB. will putC. has putD. will be put
I usually sleep with the window open ________ it is really cold.
A. ifB. unlessC. now thatD. in case
In big cities, young people often go to cafés ________ with friends.
A. relaxedB. relaxC. to relaxD. relaxing
Social media, like WeChat, ________ the way of communication nowadays.
A. are changingB. change
C. changedD. were changing
Li Hua’s parents hold different opinions on whether they should have ________ child.
A. anotherB. otherC. othersD. the other
