We spend about one-third of our lives sleeping. We know relatively little about sleep.

It’s undeniable that the Internet plays a vital role in our life nowadays.

“If I were you, I would go to the doctor.” David said to Claudia.

We couldn’t have been to go to the final match without the coach’s flexible strategies.

"You’d better think carefully before applying for that job.” She said to me.

I did not read his book. I did not understand what the lecturer was saying.

Their complaints to the head office should be sent.

The student next to me kept chewing gum. That bothered me a lot.

When he asked which one I wanted, I said I didn’t mind.

Refusal to give a breath sample to the police could lead to your arrest.

He didn’t take his father’s advice. That’s why he is out of work.

“Leave my house now or I’ll call the police!” shouted the lady to the man.

The girl forgot to set the alarm clock. Therefore, she is in a hurry now.

"You got an A in Chemistry. Congratulations!" Peter said to his classmate.

Many doctors and nurses on duty during holidays don’t have time to relax. They don’t have time to meet up with their families.

Start at once or you will be late.

I am sure he did not know that his brother graduated with flying colors.

“We preserve natural resources. We can use them in the future.” means _____.

No one but the experts was able to realize that the painting was in imitation. It greatly resembled the original.

His speech was boring. Everyone got up and left.

“Are you waiting for your exam result?” She said.