I want to buy a nice present ________ mymother and I must give it ________ her myself.

The number of the students in our school___1,600 and a number of them___ from Canada.

When did the terrible earthquake inJapan happen—-It happened _________the afternoon ofMarch 11, 2011.

Ken has gone to the Africa country to work as a volunteer.— I would rather he _____there. The situation there is very tense.

Why did you go back upstairs?— I thought I had left the window ______. [ ]