单选题 We have no money to buy a house, not to mention___a cottage.

单选题 I usually spend an hour a day( ) my English.

单选题 Mr. Smith comes to our store every day. He is our( ）customer.

单选题 Sales of the company increased( )8% in the first half of the year.

单选题 If one smokes too heavily， he is ( ) the riskof having lung cancer.

单选题 Not having breakfast will have a bad( )on your health.

单选题 Do you know the Chinese ( ) of thisEnglish word?

单选题 The computer doesn' t work.( ) system broke.