1.Columbus discovered America _not by accident____.(并非偶然)
2.__Not long ago___ I went to Beijing for a visit.(不久前)
3.The child hoped to __to be a great scientist___ (成为一位伟大的科学家)
4.You can come to see us _whenever you think____ (你想什么时候就什么时候)
5._How much is the driver's responsibility____ for the passengers'safety?(司机对...负有多大的责任)
6.The beds and chairs __are pretty comfortable___ (相当舒服)
7.Thank you for the suggestions _you put forward with goodwill____ (你善意地提供给我们的)
8.He __certainly has not seen___ the notice on the blackboard.(一定没有看到)
9.Sorry to leave you and the we __will miss you very much___.(会非常惦念你的)
10.As I _think over what had happened____,I had a new idea.(反复思考所发生的事情)