John thinks it would be long ________ he is ready for his new job.
| A．when | B．after | C．before | D．since |
On the way to the supermarket , it suddenly _______ to me that I had forgotten to lock my car , so I hurried back to lock it .
| A．happened | B．occurred | C．thought | D．came |
Hoping he would not disturb his sleeping father , Bob stole in , _____ and waited for him to wake up .
| A．not speak | B．not spoke | C．not to speak | D．didn’t speak |
Being popular with customers , the products _____ well and ____ in two months .
| A．sell ; sell out | B．are sold ; sell out |
| C．sell; will be sold out | D．are sold ; will be sold out |
Hill often attends lectures at Nanjing University , chiefly ____ his knowledge about hobbies .
| A．to acquire | B．for improving | C．to advance | D．by increasing |
.Saving resources is a basic policy of our country . And it proves _____ to its sustainable development .
| A．to be great significance | B．to be of great significant |
| C．of great significance | D．great significant |