My parents have promised to come to see me before I ____for Africa.

—You have promised to go ,then why aren’t you getting ready ？—I       you        to go at once .

Scientists have created GM tomatoes which ______ fresh for 45 days, three times as long as normal tomatoes.

The places of interest in Xi’an attract my family all the time, and I hope we _____ ourselves this time next year.

Frank, with his two sisters, _____London by train which _____at 8:30 next morning.