It’s always difficult to be in a foreign country, _____ if you don’t speak the language [ ]

bits, _________ formed, are difficultto get rid of

Oh, Jesus, I can’t cut the durian into two halves however I tried!—Easy, boy! Why not use _______ knife?

When it comes to reducing stress, enough sleep and physical exercise can help, .

u have a driver’s license— No, but I ________ driving. I plan to drive to Tibet this summer.