每空一词
我爷爷虽然八十多岁了，但仍然精力充沛。
Although my grandfather is over eighty, he is still _____________.
There are many ____________ of transportation for you to choose from, such as planes, trains.
If you want to get a job, you may have to go for a job ________________ first.
Thirty ______________by six is five.
Students should show _______________for teachers.