A strange thing happened ______ her last night, so she is afraid to stay at home alone tonight.[ ]

________ you stepped into the lab with your shoes on? You’re supposed to take them off before you enter it. I told you so!

The milk____ _strange .but it suits me_______.

I missed the first part of ________ film Avatar.－What a pity ! You should be here half _______ hour earlier.

classroom is cleaner than