SUGGESTIONS:
1.he said "Let's use public buses instead of motorbikes."
=>He suggested that
=>He suggested that public buses
2.The woman said, "what about having a plumber check the cracks."
=>The woman suggested that
=>The woman suggested that the cracks
3.Why don't you repair the computer,Ba?", she said
=>She suggested that
4.I wanted the children to study harder for the exam.
=>I suggested that
5.The principal said "Let's have students clean up the school yard every weekend"
=>The principal suggested that the