Explanation: Both A& D are correct. B is incorrect because some verbs like ‘know’ and ‘want’ are not normally used in the continuous; the correct form of B is – We knew each other well. C is not correct because for the events which are not recent, the simple past tense is used and not the present perfect tense; the correct form of C is – Wordsworth wrote a number of nature poems.

Explanation: Both B & D are correct. The correct form of A is – I’d prefer to wait rather than come again. In C, the action of leaving happened in the past (5 min ago) so the simple past form of the verb is more appropriate; the correct sentence is – He left the office barely five minutes ago.

Explanation: Both B & C are correct. The correct from of A is – I failed to do my job. The correct form of D is – I dream of making it big some day.

Explanation: Both C & D are correct. The correct for of A is – I am going to the market to buy new shoes. In B, the use of present perfect tense is more suitable; the correct sentence is – How long have they been married.

Explanation: Both B & C are correct. In A, ‘will’ should not be used to talk about something that has already been decided or arranged; the correct sentence is – I am going to the movies this afternoon. The correct form of D is – I’d rather you didn’t tell anyone about this.