Battery-operated slippers are used________seeing in the dark．
A．to
B．as
C．by
D．for
The children________not to play with fire．
A．are told
B．tell
C．asking
D．ask
The Northern Tower of Xin Hua has a long history．It________in 1835．
A．is built
B．was built
C．was building
The meeting________tomorrow is very important．You can’t miss it．
A．held
B．being held
C．to be held
D．is holding
—It’s time to go to bed，Li Ming．
—Mum，I have a lot of homework to do and I won’t go to bed________I finish it．
A．after
B．until
C．as soon as
D．since
There was an important meeting last night．Mr.Smith________to it．
A．was invited
B．invited
C．is invited
D．invites
