我仍然和我的学校朋友保持密切联系。

I'm still in ___close contact with my school friends.

我们学校与中国的一所学校有紧密联系。

Our school has ___close links with a school in China.

和我保持密切联系这么长时间，你应该知道关于乐队的一切。

Being in ___close touch with me for such a long time, you should have known everything about the band.