Question

Read the sentence.

Conducting experiments is a very exciting part of the science classroom.

safety must be the first concern of students and teachers.
Which transition best fits the pair of sentences?
А.Therefore,
B.For example,
с.On one hand,
D.However,

Answer 1

The answer is however because the teacher is saying experiment are exciting, but it’s important to be safe and take safety precautions

Answer 2

the answer should be D because it is stating something happy/nice at the beginning, but then it goes into the downside of the experiments. Which means you need a negative transition word