Question

Tractors ___________ 21(use) on farms since the start of the twentieth century. The first mechanical implements ____________22(draw) by horse. Early tractors __________ 23(pull) implements from a drawbar. In addition, it was possible for the farmer to use a power take-off shaft for trialed implements, such as manure spreaders. Since the early 1950s, there____________24(be) many improvements in design. Now, computer systems __________________25(make) it possible for farmers to check on operations.​

Answer 1

1. Are used
2. Was drawn
3. Were pulling
4. Were
5. Have made
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