【題目】________ you make a promise, you should try to keep it. Or you'll lose others' trust.
【題目】(2018邢臺二模) You'd better bring a sweater ________ it is cold there in the evening.
【題目】(2018邢臺二模) I bought my friend a birthday present, ________ he liked it very much.
【題目】(2018承德雙橋區一模) A tourist will easily lose his way in a new city ________ he has a map or a guide.