You must ________ the traffic rules when riding a bike.
make
explain
follow
Some volunteers are going to_____the central park. Let's join them.( )
put up
clean up
look up
give up
Train tickets_____online. It is convenient.( )
sold
were sold
are sold
have sold
Helen is the_____person in her family. Her two elder sisters are both married.( )
older
oldest
younger
youngest
In a restaurant, people usually choose food and drink from the_____.( )
book
menu
newspaper
magazine
_____you smell something burning? Go and see what's happening.( )
Can
May
Must
Need