1、This is ________
A.how did they get to the city
B.what did they get to the city
C.how they got to the city
D.what they got to the city
2、It is not quite clear ________ our local government will do with air pollution
A.whether
B.how
C.what
D.that
3、We will attend the junior high graduation ceremony ________ June 21st, 2019
A.in
B.at
C.on
D.for
4、Betty felt so tired last night that she ________ fell asleep in bed after lying down
A.immediately
B.suddenly
C.frequently
D.recently
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