Although the machine is _______, you need to use it correctly and safely.
.-- Which room shall we live in tonight? – In __________.
There may be something wrong with her ______,she can' t see things clearly.
The room is too small, there' s no enough ________for another desk.
He has searched the ________ or 2 hours for the information about Yang Liwei.
_________ mother is a worker.