根据句意，写出括号内所给单词的适当形式。
小题1:We love our children and our parents love ______(they).
小题2:If giant pandas are in ______(dangerous), they will attack people.
小题3:______(luck), he was not badly hurt in the car accident last month.
小题4:Thousands of ______ (tour) come to the Great Wall every year.
小题5:The places ______(mark) in red are very dangerous.