It’ s a pity that there are many teenagers _____only on-line activity is chatting with their e -pals !

What a thick fog! I went the wrong way at the corner and finally got lost.— It’s easy to make a wrong turn here even under an ideal weather________.

On the third floor there are two rooms, _____ is used as a meeting-room.

No wonder you caught a cold. You _____ out last night without a coat. — I know how silly I was.

The doctor suggested he________food which is rich ________fat and sugar. [ ]