..Only under special circumstances________to miss the final examination.A are students allowed B allowed are students C students are allowed D are allowed students
With the help of high technology, more and more new substances ______ in the past years.
--- Guess what! I have got A for my term paper. --- Great! You ______ read widely and put a lot of work into it.
--- Did you tidy your room? --- No, I was going to tidy my room but I ______ visitors.
The mayor has offered a reward of $ 5000 to ______ who can capture the tiger alive or dead.
–Tom, you didn’t come to the party last night? –I ____, but I suddenly remembered I had homework to do.