Although you may meet some difficuIties,you should never .
_______ he is young, ______ he knows much.
______ he is in trouble, his best friend always helps me.
The plane was late, _________ we has to wait for half an hour.
Tony never spends money on traveling____ he likes staying at home.
________ is not an easy thing for everyone to master a foreign language.A. That B. This C. It