To make our city more beautiful, a large number of trees ________ in the mountains last year.
| A．was planted | B．were planted |
| C．are planted | D．is planted |
---Someone is knocking at the door. Who may it be?
---It ______ be Tom. He is still in the school.
| A．can’t | B．mustn’t |
| C．couldn’t | D．may not |
Lucy had few close friends. So she didn’t know ________ about the trouble.
| A．who to talk | B．who to talk to |
| C．who to say | D．what to talk |
Her singing lessons her five hours a week．
| A．take | B．spend | C．cost | D．Pay |
He can’t state clearly how long he has ___________ the bicycle?
| A．keep | B．buy | C．bought | D．Had |
----How can I improve(提高) my listening skills?
-----_______________more.
| A．Listen | B．Listening |
| C．To listen | D．By listening |