The window broke into pieces shortly after the plane _______．（ ）
A．got offB．took upC．got upD．took off
"Do you know ________ the school library closes， Susan？"
"Ten o'clock at night．"（ ）
| A． |
when |
B． |
why |
C． |
who |
The doctor looks tired and sleepy ________ he stayed up late to look after his patients yesterday．（ ）
| A． |
because |
B． |
if |
C． |
unless |
I'm going to choose some online courses with a friend of ________ to improve our English．（ ）
| A． |
me |
B． |
my |
C． |
mine |
"Excuse me， could you tell me where I can buy a guidebook？"
"Sorry， I'm new here． You ________ ask the policeman over there．"（ ）
| A． |
shall |
B． |
can |
C． |
must |
"Meatout Day" is ________ March 20th． Many people in the world don't eat any meat that day．（ ）
| A． |
at |
B． |
in |
C． |
on |