10th English - Part: B | Grammar Challenge 18
1. Combine the following sentences using “which”. The research team developed a low-cost water filter. The filter can remove several harmful substances from contaminated water. The research team developed a low-cost water filter which could remove several harmful substances from contaminated water. The research team developed a low-cost water filter which can remove several harmful substances from contaminated water. The research team developed a low-cost water filter which has removed several harmful substances from contaminated water. The research team developed a low-cost water filter which was removing several harmful substances from contaminated water. Correct Answer: The research team developed a low-cost water filter which can remove sev...