According to the new traffic rules,people ___________ wear a helmet when riding an e﹣bike.
A.mightB.mayC.canD.must
There a computer and some books on the teacher's desk.( )
is
are
be
We have lunch_____ school from Monday to Friday.( )
on
at
with
Robots usually do work in factories.( )
heavy
heavier
heavily
You can ask some questions by telephone.( )
he
him
his
Tony's father is a .( )
teachers
doctors
driver