-------------------（检查）your homework before handing it in .(check)

-------------------（检查）your homework before handing it in .(check)
-------------------（检查）your homework before handing it in .(check)

-------------------（检查）your homework before handing it in .(check)
Check---（检查）your homework before handing it in .(check)
祈使句用动词原形

check