Question 1: Examine the usage of numerals. Won the fourth place in the 100-meter race. It is preceded by the definite article the, in ordinal form, and the fourth.

Question 2: Investigate the usage of verb phrases. The hollow part of this sentence should be filled with predicate verbs, while encouragement is a transitive verb. The meaning expressed is incomplete and should be excluded. Choose go swimming, the sentence is often in summer, which can be regarded as the simple present tense, and the subject is singular in the third person. So, go swimming.

Question 3: Investigate the usage of adjectives. The hollow part of this sentence is preceded by be and followed by of, and adjectives should be filled in. The adjective form of pride is pride. You should be proud of. I am proud of my son's achievements in school.

Question 4: Investigate the usage of verbs in passive voice. Teachers encourage students to share their ideas. This sentence can be regarded as the passive voice of the simple present tense. The hollow part is preceded by are and followed by by by. Past participle form, encourage.

Question 5: Investigate the usage of nouns. Serious should be followed by the noun plural, festivals. Music festivals, sports festivals, etc.