The words and punctuation that best corrects any errors in the sentence is option A. well-known. The word well-known should have the punctuation mark hyphen because it is a compound word. Compound words are words that consist of two or more words linked together by a hyphen, in order to create a new word with a new meaning. The word "well-known" means famous.
Answer:
i think 9 and 10 students in my school should switch classes were different subjects
The subjunctive mood is the best.
The subjunctive is rarely used in colloquial English. Totally irrelevant information, but... it is a relic from Latin, where there are many uses for a subjunctive. There is even a special conditional using the subjunctive mood that expresses the exact circumstances you described, which is usually called future less vivid.
