---- Have you finished your experiment report, Jane?----- Oh, my God. I’ve _______ forgotten all about that.

As is often the case, the fact that something is cheap doesn’t _____ mean it’s of low quality.

–You are Mr. Zhang, aren’t you? --______. 

---Volunteering is becoming           popular in China .--- Yeah, people are now aware that helping others is helping themselves.

When asked why he prefers bikes to buses, the professor said,  “Riding a bicycle takes __________ half an hour, but it’s more convenient and environmentally friendly. ”