1 It won't open because it's a security door.
2 Don't forget to lock up all the doors and windows when you leave.
3 The door which was protected by an iron grate, was intended as a safeguard against burglars.
4 Most of the houses in the area have barred windows.
5 Remember to put anti-burglary chain on the door when you lock it.
6 I bought some more locks as an additional insurance against burglary.
7 The security door is so firm that nobody can break in.
8 Do you have cover against theft?
9 The thieves run away when the burglar alarm went off.
10 All furniture is covered in fireproof fabric.
11 Kept a fire extinguisher available at all times.
12 Will you please tell us how to use the fire extinguisher to put out fire swiftly?
13 To prevent fire, do not cover the ventilation of the apparatus with newspapers, tablecloths, curtains, etc.
14 Take special precautions to prevent fire.
15 Fire doors should not be wedged open at any time.
16 Fire doors must have done their job.
17 The fire exit is located at the end of the hallway.
18 We had better buy a fire resistance rolling shutter door.
19 The roof has been fireproofed.
20 We packed the papers in fireproof safe.
21 The curtains are made of fire-resistant fabric.
22 This building which is made of steel and concrete is fireproof.
23 We need take special precautions to prevent fire.
24 Is your house insured against fire?
25 You should spare no efforts in taking precautions for the sake of yourselves, your families and your neighbours.
26 There is a fire extinguisher on hand in case of a fire.
27 We keep fire extinguisher downstairs in case of fire.
28 We've installed an extinguisher next to the cooker in case there is ever a fire.
29 Place the fire extinguisher where it is get-at-able if it is needed in a hurry.
30 Batteries must be kept in dry places lest electricity should leak away.
31 You'd better put some insulating tape on electric wires.
32 Pull the plug before you try to fix the vacuum.
33 Make sure the sockets in your house are insulated.
34 Heater must be disconnected from power supply before servicing switch.
35 We should install all-insulated switches.
36 Turn off the switch after using.
37 Make sure the current is switched off before you leave on holidays.
38 Don't touch electrical appliance with wet hand.
39 Don't wipe the TV with a wet towel.
40 Batteries must be kept in dry places lest electricity should leak away.
41 You'd better put some insulating tape on electric wires.
42 Pull the plug before you try to fix the vacuum.
43 Make sure the sockets in your house are insulated.