Some snakes have hollow teeth they are called fans that they use to poison their victims.

 “The Wall” ….. when all the members were students.

We are too late. The plane …………… off ten minutes ago.

If you want to learn English well you have to ………. hard working.

I deeply regret __________ to her so severely last night. She was badly hurt.

Human beings are ________ greatest threat to survival of endangered species.

No one likes being laughed ……….. .

The students complained that the teacher was inexperienced. 

Put plants ............... a window so that they will get enough light.

 If she ……... taller, she ………. able to join the police.

He ----------

They got success since they took my advice.

As ________ in Greek and Roman mythology, harpies were frightful monsters that were half woman and half bird.

Three women, none of whom we _______ before, _______ out of the hall.

When I asked him _____ the keys, Bob said he had no idea where they were.

 Small children have big -------------.

She raised her hand high. She wanted to attract her teacher’s attention.

He …………….. French and German.

I wish you _____ checking my e-mails. You’re invading my privacy. 

Learning the language in the country in which it is spoken is, of course, a________ more effective and faster process than studying in your own country.

_____ apologized, I wouldn’t have been so upset at the time.