A participle, a gerund, or an infinitive May be used as a noun substitute. The infinitive functions either as an adjective or as a noun.
Answer:
A. He was concentrating hard on his book
we should interact with nature even if spending time with ourselves is fun
Modular Distance Learning features individualized instruction that allows learners to use self-learning modules (SLMs) in print or digital format/electronic copy, whichever is applicable to the learner. ... The teacher takes the responsibility of monitoring the progress of the learners.
The teacher takes the responsibility of monitoring the progress of the learners. If possible, they will conduct home visits to check on each student’s progress and performance.
Fire, blankets, shelter etc
