With the improvement in transportation， students in some small villages no longer go on ropeways_______rivers to schools．（ ）
| A． |
to cross |
B． |
crossing |
C． |
crossed |
There a computer and some books on the teacher's desk．（ ）
| A． |
is |
B． |
are |
C． |
be |
We have lunch_____ school from Monday to Friday．（ ）
| A． |
on |
B． |
at |
C． |
with |
Robots usually do work in factories．（ ）
| A． |
heavy |
B． |
heavier |
C． |
heavily |
You can ask some questions by telephone．（ ）
| A． |
he |
B． |
him |
C． |
his |
Tony's father is a ．（ ）
| A． |
teachers |
B． |
doctors |
C． |
driver |