以下三大题为一封信,请根据语境填入合适的动词形式或者情态动词+助动词组合;个别空需要加上副词或者主语。 Dear sir, I (1) ____(write) to you three weeks ago, (2) ____(ask) about conditions of entry into your college. You (3) ____(reply), (4) ____(enclose) an entry form, which I (5) ____(fill up) and (6) ____(return) without delay. Since then, however, I (7) ____(hear) nothing and I (8) ____(begin) to wonder if my application (9) ____(go) astray.