1 It is and uneconomical to store too many components at one time.
2 The building is in good structual repair, but we need to it.
3 If the alarm goes off accidentally, you should it immediately.
4 It is to smoke in the workshop.
5 Turn the knob to increase the power.
6 You can the same equipment several times.
7 tests have been carried out.
8 The air supply is . We need to increase it.