if you are___ a subject,working hard and asking a teacher fo

if you are___ a subject,working hard and asking a teacher for advice can help
A weak in
B harmful to
C interested in
D pleased with
working in noisy conditions for a long time is bad for our hearing
A sour
B deaf
C grey
D well
there are several chemical factories pouring waste water into the streams .they may cause ___
A air pollution
B soil pollution
C noise pollution
D light pollution
The train is leaving right now,but David hasn it arrived yet
A CAME
B will come
C would come
D had come