21. Instruction in spoken language is not conducted sufficiently and is not reinforced by teaching aids . 22. The hand-held device is also commonly used as a teaching aid to highlight lecture material. 23. Moreover, the teachers are usually those unqualified with few teaching aids and poor textbook provision. 24. Or they may have been teaching aids , or even toys, for children, according to Sinclair. 25. WPA programs also supplied clothing, and canneries were used as teaching aids and product generation. 26. The theater troupe toured venues throughout California, including jails and juvenile halls, teaching AIDS education. 27. On 5 October 2005, one A-4SU Skyhawk was delivered to Singapore Polytechnic as a teaching aid . 28. OpenStat and Instat were developed as teaching aids . 29. The museum is regularly used by schools, colleges and adult education groups as a teaching aid . 30. He designed prototypes of functional and art objects as teaching aids and taught woodworking in Tegucigalpa.
