Miss Wei often helps us ___ our English. [ ]

Are we going camping tomorrow?—If it ______, we will go camping.[ ]

He began to learn the accordion at the age offour.(选出与画线部分意思相同的选项)[ ]

Thinking of his daughter, who was killed in an accident, _______________.

Susan’s parents have bought a large house with a swimming-pool. It ____ be very expensive.