Can you help me repair my bike —- _______.I am coming.

Radium salts，which have been found to ______ in bones，give rise to bone cancer.

More and more people have a low-C life and the air is_________ than before.

It snowed heavily last night. Is ______here today—Yes,and ______of us was late for school thismorning.

d not feel ashamed of our failure. We may, _______, face it realistically and accept it optimistically.