Please let us have more time to play outside， _____?

Solar energy is a new kind of energy _____ that we can use to replace the traditional energy.

Our teachers always tell us to believe in （ ） we do and who we are if we want to succeed.

The bad weather （ ） the building program by several weeks．

The whole class couldn’t help _____ when they saw the haircut of their new classmate.

Scientists now have some surprising answers about whether brain power（ ）as we get older.

Dentists suggest brushing teeth at least twice a day to _____ them from decaying.

Only when （ ） in the afternoon （ ） able to leave.

Do you mean this is the_____decision you have made after thinking for hours?

（ ） is careless when disposing of his wastes.

There is a warning at the bottom of the form that applicants are requested to hand in their forms _____ person.

The two parties haven’t reached any agreement, but decided to set another date for （ ） talks.