Must we finish all the exercises today? — No, you ________.You can finish them within two days.

____ is the weather ____in Beijing?

Another drug that has helped improve people’s health is penicillin, _________ is _________ by many _________ one of the most important medicines.

― How do you feel when you watch the national flag go up?― It makes me ________ very proud.

The man ________ was a friends of mine.