(2013·新课标全国卷Ⅰ) Try not to cough more than you can ________ since it may cause problems to your lungs.
Learning English means _________ memorizing a huge lot of words.It involves a large amount of reading as well.
Tom as well as two of his classmates _____ invited to the party.
The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
My grandfather is always thinking for others. In another word, he is always ________.
Driving on the road, drivers do ______ the traffic rules, which is responsible for themselvesas well as others.