Look!The man at the school gate _________ be our headmaster.He is always standing there to welcome us every morning.
No,it _______ be him.He is holding a meeting in the office now.( )
must; can't
must; mustn't
can't; mustn't
Reading books ________ a bridge between our lives and the unknown world.( )
built
build
builds
Chinese parents always try their best ________ a good education environment for their kids.( )
provide
to provide
providing
"Tom, would you please take out the rubbish?"
"Just a minute, mom, I ________ a phone call."( )
make
makes
am making
"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