Some students are so ______ that they often make mistakes in their homework.
A．carful B．serious C．careless D．successful
__ we are young, we can still do something to help protect the environment.
A．If B．Since C．Because D．Though
--- Jimmy, don’t put this pair of trousers on the sofa.
--- Sorry, mum. I will _____________ right now.
A．take it away B．take them away
C．knock it off D．knock them off
---You were out when I went to your house this morning.
---Oh, I _______ for a friend from England at the airport.
A．was waiting B．waited
C．am waiting D．have waited
_____Hepburn’s acting years, she insisted _______ working closely with UNICEF.
A．Though, to B．Throughout, to
C．Throughout, on D．Throughout, onto
I ________ a bag. ________ a new bag on the desk.
A．am; There is B．have; There is
C．has; There is D．is; There are
