f) If you speak about the plants you don't use any preposition Correct: She sprays the orchids g) depends on what you want to say. If you show a bridge to someone and pointing to it, you say this is... if you are describing a bridge, speaking about it and then want to say about its size you also say this is...
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Vincent Teo(a) My grandfather is very healthy. OK
(b) She received an angpow fromhisher parents. (I have no idea what an "angpow" is.)
(c) He climbed up to the peak (of the mountain) OK