occur

现场直播期间有时会出现技术问题。

Technical problems sometimes ___occur during the live broadcast.

如果机器没有得到适当维护，可能会发生严重损坏。

Serious damage can ___occur if the machine is not properly maintained.

如果在服药期间出现任何这些症状，请立即咨询医生。

If any of these symptoms ___occur while you are taking the medicine, consult your doctor immediately.