If you want to be popular, , join in our class activities and make a contribution to our class if possible.
______ reduce pollution,the government has made a policy to restrict the use of plastic bags in some areas.
The boy always spent the whole day ______ in the room reading English during the holiday.
Bad habits, _______ formed, are difficult, and sometimes impossible to shake off.
The monument was built in honor of the explorer who was believed _____ the river.
________ blood if you can and many lives will be saved.