There are so many viruses on the Internet. If ______ accidentally, the viruses may make your computer break down.

_____ you do, I will support you. -Thank You.

English is interesting, _______ I didn’tlike it at first.

Don’t be so discouraged. If you ________such feelings, you will do better next time.

What the doctors really doubt is ____ my mother will recover from the serious disease soon[ ]