Steve is very strong and healthy. Strangely enough, he ____ have been infected by HINI virus. A would B must C should D might
The school rules state that no child shall be allowed out of the school during the day, __________ accompanied by an adult.
Now a lot of new technologies can ___________ problems in industry.
________ entered the classroom _________ the bell rang.
So loudly ______ that every one of the class could hear him.
---What do you think made her so upset? ---_____________ her hometown.