If we _________ the earth, we must take action before it is too late.

Cycling is a good way of exercise and is quite easy _________.

---Did you make a phone call to your parents?

---Certainly. Hardly ____ the destination (目的地) when I phoned them.

 Given that (鉴于) you feel so stressed , you _____ as well take a weekend break to relax yourself.

The former (先前的) secretary was not equal to the job. But to my annoyance (恼火), the new secretary is _______ qualified (胜任的) for the job than her. 

Ever since junior middle school , Jack as well as his sisters ______ of travelling around the world.

I was about to sail away ______ I heard the sound of stamping and singing on the bank,

Personally, it is no good ________ online all day long. It is really a waste of time. 

 Living on his own and only having a dog _____ company, the old man feels ______.

 ______ you make a promise, you should keep it.