Growing up _____ be difficult, for you will come across many things that confuse you．

It is the respect for universal rights, our respect for different cultures, and our _________ to international laws that guide China's openness to other countries.

(2013·高考新课标全国卷Ⅰ)Try not to cough more than you can________since it may cause problems to your lungs.

To my surprise, the game drew only a few ____ participants and spectators yesterday.

Having walked in the desert for several days，we finally reached what was called oasis，________.