Complete the sentences using suitable clauses/phrases. (a) The lecture hall was overcrowded; there were so many students that _________ . (b) The pollution level is rising dangerously. It is high time we _________ . (c) He neglected his health for years. _________ , he would not have fallen so ill. (d) She hurried to submit the assignment lest _________ . (e) The theory was highly complex. It was too difficult _________. (f) You cannot travel abroad unless _________ . (g) The weather looks uncertain. Take an umbrella in case _________ . (h) They postponed the outdoor event because _________ . (i) Books are a gateway to wisdom. A person can acquire vast knowledge by _________. (j) Stay here until _________ . Do not leave without permission.