Remember to ________ a good state of mind even if you should fail plenty of times．

Jane _____ some washing this timeyesterday.

pains-taking efforts, he eventually concluded that the principle he stuck _______ true.

How often do I need to feed the birds?—They ________ food every day，or they will behungry.

Which of the two CDs will you buy—I’ll buy ______. Then I can give one to my friend Linda.