It is a slow process to _______ a good knowledge of English.

 –Shall we go there by bus? --That ___ me fine .Thank you .

____cleaning the yard and making up the beds for the old, we also read newspapers for them and had chats with them.

The computer system _____ suddenly while he was searching for information on the Internet.

— What question did the teacher ask just now?— She asked how well this material     electricity or heat.