Must I turn off the gas after cooking ? –Of course You can never be ___ careful with that

Helen has been looking for a job over the whole year，feeling she can’t get________without work experience.

ng, now a student of Shanghai JiaotongUniversity majoring in financial management, _______basketball in NBA for nineyears.

The computer system suddenly_____ while he wassearching for information on the Internet.

There an English speech contest this afternoon.