Choose the correct verb from those in brackets:
1). The earth -------------------- round the sun. (move; moves; moved).
2). Ashok fell off the ladder when he ------------------- the roof. (is mending; was mending; mended).
3). My friends ------------- the Prime Minister yesterday. (see; have seen; saw).
4). This paper ------------------ twice weekly. (is appearing; appearing; appears).
5). I ------------------ him only one letter upto now. ( sent; have sent; send)