Answer:
a. on
b. I don't think here a preposition is needed as "This is the key to my room" is a complete sentence.
c. in
d with
Hope it helps!!
Have a nice day:)
1.) special; adjective
2.) well; adjective
3.) firmly; adverb
4.) good; adjective
5.) wrong; adjective
6.) strongly; adverb
7.) good; adjective
8.) slowly; adverb
9.) well; adverb
10.) clearly; adverb
11.) definite; adjective
12.) angry; adjective
13.) quickly; adverb
14.) badly; adverb
15.) difficult; adjective
16.) surely; adverb
17.) well; adverb
Hope this helps!
Cars were designed for transportation. After time, they became one of the main causes of pollution.
Have a nice day :D
