If _____ carefully, the experiment will be successful.

Some people plan to ______ a volunteer project to help the disabled children.

Can you tell me _____ the birdwatchers in Zhalong Nature Reserve? I only know that _____ of them are from our school.

I’m so glad to see you back, Lucy. How long _______at your grandma’s?

They _________ us150,000 dollars for the house. Shall we take it?