【简答题】用适当的介词填空。 1. They are staying there _____ three weeks. 2. She is leaving _____ June 15th. 3. What are they doing _____ vacation? 4. Alice is going camping _____ her classmates. 5. They are buy working...
【简答题】二、选择适当的词填空。 1. Ben is going to ________ (swim/swimming) in the sea tomorrow. 2. My father ________ (am/is ) going to Beijing this Sunday. 3. I _______ (will / am going to )be a teacher in 15 years. 4....