Câu 1: Don't understand ; will explain 
Câu 2: Will be done
Câu 3: Will be waiting ;  will be standing 
Câu 4: Has been visited 
Câu 5: Has improve ;  moved
Câu 6:  are waiting ;  have waited 

VII. Put the verbs in brackets in their correct form (active or passage) to complete
the sentences
1. Don’t worry. If we (not understand) don't understand the lesson, the teacher (explain) will explain it again.
2. Nothing (do) will be done till they reach a decision.
3. – “Where is Tim going to meet us?”
- “He (wait) will be waiting for us when our train arrives. I am sure he (stand) will be standing on the platform when we pull into the station.”
4. The new museum (visit) has been visited by millions of people so far.
5. His English (improve) has improve greatly since he (move) moved to Australia.
6. – “Excuse me, which movie are you waiting for?”
- “We (wait) are waiting for the new Stars Wars movie. In fact, we (wait)  have waited here for more than five hours.”