A ruler is 2 dollars and a pen is 5 dollars. How much are they? -They are

I’m going to learn the piano when I retire. —That sounds ______ a good idea. [ ]

We often plant _______trees every year.

Where does he want to go on vacation?—He wants to go to a place ______ it’s neither hot nor cold the whole year.[ ]

I feel it hard to keep up with my classmates. But whenever I want to _______, my teacher always encourages me to work harder.