I’m better at science __________ art.

题目

I’m better at science __________ art.
They are waiting __________ David.
I am sitting here all __________ myself.
You can have some cakes __________ they are ready.

答案

I’m better at science __than__ art.They are waiting __for__ David.I am sitting here all ___by__ myself.You can have some cakes __after___ they are ready.