At first, the company had 15 notebook computers but only one – third used regularly. Now we have over 60 working all day long.
While listening to the concert, the audience is required to remain ______ and keep quiet.
It is important to know about the cultural differences that______ cause problems.
In classes, you’d better understand as much as possible while ______ notes.
Thank you for all your hard work last week. I don’t think we ______ it without you.
The Great Wall is a place ______ almost all tourists would like to visit when they come to Beijing.