【推荐2】Scientists are ______ about the United States’ scheduled return to the Moon due to the delays in the development of the required spacesuits.

A．frank

B．skeptical

C．casual

D．identical

【推荐3】Despite the rise in technology-based learning tools, the school chose to maintain ______teaching methods, emphasizing the value of face-to-face interaction in the classroom.

A．identical

B．substantial

C．botanical

D．conventional