More and more people found _________ necessary to have a balanced diet.
There are two new buildings near the sea, and ____of them are very tall.
Now, everybody, please turn to page _________and look at the ___picture.
Is that Lucy’s sister, Lily?—No, it _______ be her. She has gone to English.
As we all know, every minute, ____full use of____our lessons , will do good to our students．