We should keep the door and the windows _________ to get quiet because it’s too noisy outside.

If you eat this kind of plant, you ____ very sick. [ ]

.I think _________ of the materials I listened to at the beginning of the exam ____ easy.

He usually goes to school ____ bike, but sometimes he _____a taxi to school.

I gave up the piano lessons because I have so much homework to do, but it’s _______ my own wishes.[ ]