26. With age, the mineral content of human bones decreases, ______ them more fragile.
| A．make | B．to make | C．made | D．Making |
On April Fool’s Day people often play tricks _____ others.
| A．to | B． with | C．on | D．in |
Middle school students are not permitted _______.
| A．to smoke | B． smoking | C．smoke | D．smoke d |
Do you still remember the museum _____ we visited three months ago?
| A．where | B． when | C．which | D．what |
She is pleased with _________ you have given her and all that you have told her.
| A．that | B． what | C．why | D．which |
I think it is unfair, ___________?
| A．do I | B． is it | C．don’t I | D．isn’t it |