Easy
1 point
ID: #15271
Question
The engineer insists on - good materials.
Options
1
use
Correct Answer
2
using
Correct Answer
3
to use
Correct Answer
4
the use
Correct Answer
Explanation
The preposition 'on' is followed by a gerund (verb + ing). Therefore, 'using' is the correct form. 'Insist on doing something' is the standard grammatical structure for this verb.