People would often have to (38) ________ very careful arrangements to be sure of meeting up.

ANSWER C

Knowledge: Read and fill in words

Explain:

We have a fixed phrase: make an arrangement to do st = arrange to do st: make an arrangement to do st So the correct answer is: C

Information: People would often have to (38) ___make___ very careful arrangements to be sure of meeting up. As mobiles have become more popular, so they have become more powerful. People often have to arrange very carefully to be sure to meet. As mobile phones become more popular, so do they become more powerful.