____ the Internet is of great help, I don’t think it’sa good idea to spend too much time on it.

I discovered that listening to ______is the secret ______language learning.

we admit that there are some problems with the new system, we believe they can be solved.

My alarm doesn’t work now. Could you help me fix it—___________.

Many new workers ________ and after six months they will be sent to build a new railway.[ ]