一辆农用“小四轮”漏油,假如每隔l s漏下一滴,车在平直公路上行驶,一位同学根据漏在路面上的油滴分布,分析“小四轮”的运动情况(已知车的运动方向)。下列说法中正确的是
"Do you know ________ the school library closes, Susan?"
"Ten o'clock at night."( )
when
why
who
The doctor looks tired and sleepy ________ he stayed up late to look after his patients yesterday.( )
because
if
unless
I'm going to choose some online courses with a friend of ________ to improve our English.( )
me
my
mine
"Excuse me, could you tell me where I can buy a guidebook?"
"Sorry, I'm new here. You ________ ask the policeman over there."( )
shall
can
must
"Meatout Day" is ________ March 20th. Many people in the world don't eat any meat that day.( )
at
in
on