You should your teacher’s advice if you want to improve your science.— That sounds great.

Extra boiling water should be kept at hand just ______ it is needed.

Students feel ______ when they have some difficulties in study.

We_______sixdaysaweek,butweonlyworkfivedaysnow.

_______ do you think of the basketball match— It’s perfect. It’s more exciting than _______ matchthat I have ever watched.