_____ the Internet is of greathelp, I don’t think it’s a good idea to spend too much time on it.

(2014·河北教学质量检测)Many people tried to leave the country，________there was much violence and a serious shortage of food supply.

Professor Smith，along with his assistants，on the project day and night to meet the deadline.

23 Once you make a promise, you should carry it _____

Do you remember ____when you heard about the important eventYes, I do