Ⅰ.单句语法填空
1．Did you leave the doors and windows firmly ________(fasten)?
2．It was when he was about to go to bed ________ the telephone rang.
3．The true wealth do not consist ________ what we be.
4．Our literature and art ought to cater ________ popular taste.
5．It's time I got down to ________(think) about that essay.
