1. Some universities offer free, non-credit MOOCs __________?to anyone in the world.
A. useful
B. available
C. easy


2. Quizzes are part of the lecture program to keep students engaged and keep them _________, for students to be able to check that they understood what was covered.
A. thinking
B. think a lot
C. to think


3. I have _________?some courses and software to my Smartphone, and I find they are very interesting and easy to use.?
A. uploaded
B. downloaded
C. copied


4. Well, that's to say, every coin has two sides, ________?technology.
A. so is
B. so does
C. so has


5. _________?we've no money, we can't buy it.
A. Since
B. Because of
C. Therefore


(责任编辑：admin)要这答案加QQ：800020900 或加微信：vq800020900 获取